add pathname and line number to logging formatter in debug mode
# What does this PR do?
This PR adds pathname and line number to logging formatter in debug mode
It make the debug much easier when setting `export TRANSFORMERS_VERBOSITY=debug`. 
It has no effect in other logging levels(info, warning, etc ). 

Hope this is acceptable. It's ok if not. 

before, there is no way to know where the logging comes from. 
```
loading file vocab.json
loading file merges.txt
loading file tokenizer.json
loading file added_tokens.json
loading file special_tokens_map.json
loading file tokenizer_config.json
```
after:
```
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file vocab.json
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file merges.txt
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file tokenizer.json
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file added_tokens.json
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file special_tokens_map.json
[INFO|/home/ranch/models/transformers/src/transformers/tokenization_utils_base.py:1842] 2023-07-31 17:59:45,311 >> loading file tokenizer_config.json
```

_The documentation is not available anymore as the PR was closed or merged._<|||||>hi, @amyeroberts thanks very much for commenting! I have added a "detail" level. It's the same as debug but will also print the pathname and line-number for easy debugging. I don't know if that looks good ?  Thanks!