SentenceDetector features extraction bug

Describe the bug https://github.com/curiosity-ai/catalyst/blob/cd575bfa2ce3e114a6ea03770ae440e439b283cd/Catalyst/src/Models/Base/SentenceDetector.cs#L418 In that line and next 3 used equality operator wich not implemented for IToken, so thats always false

https://github.com/curiosity-ai/catalyst/blob/cd575bfa2ce3e114a6ea03770ae440e439b283cd/Catalyst/src/Models/Base/SentenceDetector.cs#L423 Next token cannot be BOS and previous cannot be EOS when process document for sentences

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Still relevant