Add support to trigger pause from widgets

[PardhavMaradani]

Changes made in this Pull Request:

• Allow widget analyses code to trigger pause event
• Rename per-frame to every-frame
• _patch_IMDReader is now a static method to not serialize WidgetManager
• Fix add widget layout issue

PR Checklist

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

---

This PR allows widget classes to pause the simulation (equivalent to user pausing from the dashboard UI) when certain conditions are met. This will allow users to freeze the current state to investigate if required.

[read-the-docs-community]

Documentation build overview

📚 mdadash | 🛠️ Build #33495883 | 📁 Comparing ea3291e against latest (4a47107)

  🔍 Preview build  

18 files changed · ± 18 modified

± Modified

• genindex.html
• autosummary/mdadash.backend.analyses.com_distance.html
• autosummary/mdadash.backend.analyses.dssp.html
• autosummary/mdadash.backend.analyses.energies.html
• autosummary/mdadash.backend.analyses.janin.html
• autosummary/mdadash.backend.analyses.ramachandran.html
• autosummary/mdadash.backend.analyses.rog.html
• autosummary/mdadash.backend.kernel.core.html
• autosummary/mdadash.backend.widgets.base.html
• _modules/mdadash/backend/analyses/com_distance.html
• and 8 more...

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (4a47107) to head (ea3291e).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

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

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