feature: combobox field

[adrianthedev]

Description

Important

This needs to be another gem.

Fixes #3317
Related to #2711

Other PRs: #2646 & #2718

Checklist:

• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works

Screenshots & recording

Manual review steps

1. Step 1
2. Step 2

Manual reviewer: please leave a comment with output from the test if that's the case.

[codeclimate]

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[github-actions]

[rubocop] _{reported by reviewdog 🐶}
[Corrected] Style/StringLiterals: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.

[github-actions]

[rubocop] _{reported by reviewdog 🐶}
[Corrected] Style/StringLiterals: Prefer double-quoted strings unless you need single quotes to avoid extra backslashes for escaping.

[adrianthedev]

Still waiting for a response on this thread in regards to supporting objects as values.

josefarias/hotwire_combobox#221

[github-actions]

[rubocop] _{reported by reviewdog 🐶}
[Corrected] Layout/IndentationWidth: Use 2 (not 1) spaces for indentation.

[adrianthedev]

This field needs to be another gem.
The reason is that it does not support Rails 6.1 so it will be difficult to ignore it in tests but also because it adds another dependency (in gemspec and some styles) to installations that potentialy don't need it.