Setting special tokens values in TokenizerConf

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cacc1ee) 91.33% compared to head (94a638e) 91.34%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #114 +/- ## ========================================== + Coverage 91.33% 91.34% +0.01% ========================================== Files 33 33 Lines 4799 4808 +9 ========================================== + Hits 4383 4392 +9 Misses 416 416 ```

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