byte to int in TruncateTokenFilterFactory to TruncateTokenFilter

### Description

TruncateTokenFilterFactory class parses PREFIX_LENGTH_KEY value as Byte which goes upto 127 and then is stored in prefixLength attribute. TruncateTokenFilter class expects the argument in int which has a bigger range than byte. Any value greater than 127 throws a exception while being parsed as Byte in the TruncateTokenFilterFactory class.

I didnt see any documentation in the TruncateTokenFilterFactory class that this value should be less than 128.

### Version and environment details

Lucene 9.7.0 . Also verified in latest main code.

Start with TruncateTokenFilterFactory, where PREFIX_LENGTH_KEY is parsed, and compare its prefixLength handoff with TruncateTokenFilter’s int parameter. Verify that values greater than 127 are accepted without a parsing exception, and check whether the factory documentation needs updating.

Written by the indexing model from the issue text.