* feat(tokenizers): add truncate test case
* !feat(tokenizer): truncate right
* refacto(tokenizers): clippy
* feat(bindings): update bindings for truncate()
* fix(tokenizers): remove unsafe code
* refacto(tokenizers): truncate direction
* truncate direction enum
* compute parts ranges beforehand
* 2n space because encoding is dropped at the end of procedure
* update bindings
* add pip install in python bindings' make test
* fix(node): clippy asks to use unwrap_or_else
* fix(node): lint
* refacto(tokenizers): replace Vec<Range<usize>> by Vec<(usize, usize)>
* refacto(bindings): add match syntax
* refacto(tokenizers): use mem::replace instead of mem::swap
* refacto(tokenizers): assign value the normal way
