Implement Feed layout

[philippjfr]

We want complete component parity with Panel in order to be able to enable certain other optimizations (e.g. disabling the shadow DOM). In this PR we reimplement the Feed component from Panel.

[codecov]

Codecov Report

❌ Patch coverage is 21.92982% with 89 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.23%. Comparing base (ac57c5d) to head (3f7c216).

Files with missing lines	Patch %	Lines
src/panel_material_ui/layout/base.py	21.92%	89 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (ac57c5d) and HEAD (3f7c216). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (ac57c5d)	HEAD (3f7c216)
	7	6

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #608       +/-   ##
===========================================
- Coverage   82.03%   67.23%   -14.80%     
===========================================
  Files          31       31               
  Lines        3228     3339      +111     
===========================================
- Hits         2648     2245      -403     
- Misses        580     1094      +514     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.