[openstreetmap/openstreetmap-website] Adding map note tags - part 1 - added migration script and model files (PR #5323)

[Nenad Vujicic]

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### Description
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Added migration for creating `note_tags` DB table, created model file `NoteTag.rb`, updated associations with `Note` class and added `note_tag` factory and unit tests `NoteTagTests` for testing basic functionalities (key/value lengths validity, key/value lengths invalidity, orphaned tags invalidity and note-tags uniqueness).

This PR is first step of adding support for map note tags described in #5294 and which fully implementation can be found [here](https://github.com/nenad-vujicic/openstreetmap-website/tree/issue_5294_poc) (decomposed to smaller because of simpler review).

### How has this been tested?
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Tested by running linters from `lint.yml` workflow, unit tests and by manually inserting note-tags manipulations and as part of [complete implementation](https://github.com/nenad-vujicic/openstreetmap-website/tree/issue_5294_poc) locally.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5323

-- Commit Summary --

  * Added NoteTag model and note_tags table
  * Added note_tag factory and NoteTag model test-case

-- File Changes --

    M app/models/note.rb (2)
    A app/models/note_tag.rb (20)
    A db/migrate/20241030122707_create_note_tags.rb (13)
    M db/structure.sql (35)
    A test/factories/note_tags.rb (8)
    A test/fixtures/note_tags.yml (11)
    A test/models/note_tag_test.rb (49)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5323.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5323.diff

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