Cleanup of different inputs

[PardhavMaradani]

Changes made in this Pull Request:

• Cleanup of inputs
• Add server side validation for maxlen
• Add support for select dropdown

PR Checklist

• Tests?
• Docs?
• CHANGELOG updated?
• Issue raised/referenced?

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This PR cleans up inputs in the settings and widget page. It also adds support for a select dropdown.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (83c6934) to head (51e8306).

Additional details and impacted files

Components	Coverage Δ
frontend	100.00% <100.00%> (ø)
backend	100.00% <100.00%> (ø)

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[read-the-docs-community]

Documentation build overview

📚 mdadash | 🛠️ Build #33243394 | 📁 Comparing 51e8306 against latest (83c6934)

  🔍 Preview build  

5 files changed · ± 5 modified

± Modified

• autosummary/mdadash.backend.analyses.rog.html
• _modules/mdadash/backend/analyses/com_distance.html
• _modules/mdadash/backend/analyses/energies.html
• _modules/mdadash/backend/analyses/rog.html
• _modules/mdadash/backend/widgets/base.html