[Llama Tokenizer] Fast llama template
# What does this PR do?
Adresses #22794 and #22877
_The documentation is not available anymore as the PR was closed or merged._<|||||>The test `tests/models/llama/test_tokenization_llama.py::LlamaIntegrationTest::test_conversion` is failing since April 27th, which is likely due to this PR. See issue page #23400