introduce lix validation rules

[samuelstroschein]

Context

We built validation rules (formerly called lint rules) in inlang, which are extremely helpful. With lix gaining an understanding of changes, which are the trigger for validation rules, we can build a generalized validation rule system in lix.

The formerly called lint rule feature has been removed in the inlang SDK v2 as part of the lix rewrite.

Understanding.Linting.in.SDK.Updates.mp4

Proposal

Introduce a validation rule API in lix.

Potential requirements

• generalizable e.g. works for any change (inlang, csv, markdown)
• fixable
• different levels (error, warning, info, etc., best if user can define them)

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