Implement browse chips for search screen

[uragiristereo]

Browsing is just getting easier, the "space" each tags indicates an "and" notation to show only the posts that contains those tags, it was confusing before for users that aren't familiar with how Danbooru works. Now, with chips introduced users are able to know that they're searching with two different tags.

The tags are colored based on their category, supports for exclude tag with dash (-) prefix, qualifiers (search:, ordfav:), also or notation like (tag1 or tag2). The colors are retrieved from getting tags from search query, search autocomplete and getting tags from the post detail bottom sheet, then stored into the local database. The database version remains unchanged because the previous migration has not done in production.

This PR marks the first time an unit test is introduced to the project.

Result (left before, right after)

Summary of changes

• Implemented a new table: tag_categories
• Introduced a new repository: TagCategoryRepository
• Introduced a new use case: GenerateChipsFromTagsUseCase
• Added testing scenario
• Implemented the chips UI
• Integrated the chips UI into existing search feature

What to do after this PR?

• Add support for more qualifiers