text: Title: Unnecessary dependency on FuzzyTM pulls in many libraries
  Body: #### Problem description
  
  I'm trying to upgrade to the new Gensim 4.3.0 release. My colleague @juhoinkinen noticed in https://github.com/NatLibFi/Annif/pull/660 that Gensim 4.3.0 pulls in more dependencies than the previous release 4.2.0, including pandas. I suspect that at least the FuzzyTM dependency (which in turn pulls in pandas) is actually unused and thus unnecessary.
  
  #### Steps/code/corpus to reproduce
  
  Installing Gensim 4.2.0 into an empty venv (only four packages installed):
  
  ```
  $ pip install gensim==4.2.0
  Collecting gensim==4.2.0
    Downloading gensim-4.2.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (24.0 MB)
       ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 24.0/24.0 MB 2.0 MB/s eta 0:00:00
  Collecting scipy>=0.18.1
    Downloading scipy-1.10.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (34.4 MB)
       ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 34.4/34.4 MB 3.3 MB/s eta 0:00:00
  Collecting numpy>=1.17.0
    Downloading numpy-1.24.1-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (17.3 MB)
       ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 17.3/17.3 MB 10.6 MB/s eta 0:00:00
  Collecting smart-open>=1.8.1
    Downloading smart_open-6.3.0-py3-none-any.whl (56 kB)
       ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 56.8/56.8 KB 9.7 MB/s eta 0:00:00
  Installing collected packages: smart-open, numpy, scipy, gensim
  Successfully installed gensim-4.2.0 numpy-1.24.1 scipy-1.10.0 smart-open-6.3.0
  ```
  
  Installing Gensim 4.3.0 into an empty venv (18 packages installed):
  
  ```
  $ pip install gensim==4.3.0
  Collecting gensim==4.3.0
    Downloading gensim-4.3.0-cp310-cp310-manylinux_2_17_x86_64.manylinux2014_x86_64.whl (24.1 MB)
       ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 24.1/24.1 MB 6.9 MB/s eta 0:00:00
  
  [...skipping downloads...]
  
  Installing collected packages: pytz, urllib3, smart-open, six, numpy, idna, charset-normalizer, certifi, scipy, requests, python-dateutil, simpful, pandas, miniful, fst-pso, pyfume, FuzzyTM, gensim
    Running setup.py install for miniful ... done
    Running setup.py install for fst-pso ... done
  Successfully installed FuzzyTM-2.0.5 certifi-2022.12.7 charset-normalizer-2.1.1 fst-pso-1.8.1 gensim-4.3.0 idna-3.4 miniful-0.0.6 numpy-1.24.1 pandas-1.5.2 pyfume-0.2.25 python-dateutil-2.8.2 pytz-2022.7 requests-2.28.1 scipy-1.10.0 simpful-2.9.0 six-1.16.0 smart-open-6.3.0 urllib3-1.26.13
  ```
  
  The size of the venv has grown from 249MB to 318MB, an increase of 69MB.
  
  Here is what `pipdeptree` shows - FuzzyTM appears to be the main reason why so many libraries are pulled in:
  
  ```
  gensim==4.3.0
    - FuzzyTM [required: >=0.4.0, installed: 2.0.5]
      - numpy [required: Any, installed: 1.24.1]
      - pandas [required: Any, installed: 1.5.2]
        - numpy [required: >=1.21.0, installed: 1.24.1]
        - python-dateutil [required: >=2.8.1, installed: 2.8.2]
          - six [required: >=1.5, installed: 1.16.0]
        - pytz [required: >=2020.1, installed: 2022.7]
      - pyfume [required: Any, installed: 0.2.25]
        - fst-pso [required: Any, installed: 1.8.1]
          - miniful [required: Any, installed: 0.0.6]
            - numpy [required: >=1.12.0, installed: 1.24.1]
            - scipy [required: >=1.0.0, installed: 1.10.0]
              - numpy [required: >=1.19.5,<1.27.0, installed: 1.24.1]
          - numpy [required: Any, installed: 1.24.1]
        - numpy [required: Any, installed: 1.24.1]
        - scipy [required: Any, installed: 1.10.0]
          - numpy [required: >=1.19.5,<1.27.0, installed: 1.24.1]
        - simpful [required: Any, installed: 2.9.0]
          - numpy [required: >=1.12.0, installed: 1.24.1]
          - requests [required: Any, installed: 2.28.1]
            - certifi [required: >=2017.4.17, installed: 2022.12.7]
            - charset-normalizer [required: >=2,<3, installed: 2.1.1]
            - idna [required: >=2.5,<4, installed: 3.4]
            - urllib3 [required: >=1.21.1,<1.27, installed: 1.26.13]
          - scipy [required: >=1.0.0, installed: 1.10.0]
            - numpy [required: >=1.19.5,<1.27.0, installed: 1.24.1]
      - scipy [required: Any, installed: 1.10.0]
        - numpy [required: >=1.19.5,<1.27.0, installed: 1.24.1]
    - numpy [required: >=1.18.5, installed: 1.24.1]
    - scipy [required: >=1.7.0, installed: 1.10.0]
      - numpy [required: >=1.19.5,<1.27.0, installed: 1.24.1]
    - smart-open [required: >=1.8.1, installed: 6.3.0]
  pip==22.0.2
  pipdeptree==2.3.3
  setuptools==59.6.0
  ```
  
  It appears that the FuzzyTM dependency was added in PR #3398 (Flsamodel) by @ERijck . The first commits in this PR depended on the library, but a subsequent commit 9fec00b32d281e795f3b4701bf11fa1c97780227 reworked the code so it doesn't need to import FuzzyTM at all. But the dependency in setup.py wasn't actually removed, it's still there: https://github.com/RaRe-Technologies/gensim/blob/f35faae7a7b0c3c8586fb61208560522e37e0e7e/setup.py#L347
  
  I think the FuzzyTM dependency could be safely dropped, as the library is not actually imported. It would reduce the number of libraries Gensim pulls in and thus reduce the size of installations, including Docker images where minimal size is often required.
  
  #### Versions
  
  I'm using Ubuntu Linux 22.04.
  
  Linux-5.15.0-56-generic-x86_64-with-glibc2.35
  Python 3.10.6 (main, Nov 14 2022, 16:10:14) [GCC 11.3.0]
  Bits 64
  NumPy 1.24.1
  SciPy 1.10.0
  gensim 4.3.0
  FAST_VERSION 0