feat: filter by tag value

[Saimo]

https://github.com/louislam/uptime-kuma/blob/master/CONTRIBUTING.md#can-i-create-a-pull-request-for-uptime-kuma

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Description

This feat allows filtering by tag values. Mostly finished on the backend but needs some cosmetic fixes.
This is an early version of the implementation.

Fixes #3641

Type of change

• User interface (UI)
• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I ran ESLint and other linters for modified files
• I have performed a self-review of my own code and tested it
• I have commented my code, particularly in hard-to-understand areas
  (including JSDoc for methods)
• My changes generate no new warnings
• My code needed automated testing. I have added them (this is optional task)

Screenshots (if any)

[chakflying]

No need to commit package-lock if there are no package changes.

[CommanderStorm]

@Saimo Is keeping this PR a draft intentional?

Also note that this PR includes lots of (I think) unintentional changes which make reviewing difficult => please revert those.
From a UI perspective, I don't think the circles look like they fit into our current desin language => please refactor this to look more like a part of our UI to be able to merge this.