Add UniDic implimentation

[mosuka]

Pull Request

What does this PR do?

• Add UniDic implementation to allow consistent tokenization for searching and indexing.
• Please see discussion comment

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• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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[ManyTheFish]

Hello @mosuka, thank you for your PR!
Because these two feature flags are incompatible, we should add a compiling error in case they are both activated:

#[cfg(all(feature = "japanese-segmentation-ipadic", feature = "japanese-segmentation-unidic"))]
compile_error!("Feature japanese-segmentation-ipadic and japanese-segmentation-unidic are mutually exclusive and cannot be enabled together");

[mosuka]

@ManyTheFish
Thank you for your comment.
I'll fix it. 👍

[mosuka]

@ManyTheFish
I have modified it as you advised.
Please check it again.

[ManyTheFish]

thanks @mosuka!

Bors merge

[meili-bors]

Build succeeded:

• tests

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