remove legacy TokenTrie

[Saibo-creator]

Currently there is ByteTrie at https://github.com/epfl-dlab/transformers-CFG/blob/main/transformers_cfg/tokenization/trie.py#L21
and also a TokenTrie at https://github.com/epfl-dlab/transformers-CFG/blob/main/transformers_cfg/tokenization/vocab_struct.py#L13

TokenTrie is the legacy code from previous implementation and it should be completely removed and replaced by ByteTrie.

There is still dependency on it in the parsing, so may need to treat it carefully