feat: Live resource view

[jannfis]

What does this PR do / why we need it:

This PR introduces functionality to provide live resource view from the agents to the control plane. It also lays the groundwork for remote log viewing.

Which issue(s) this PR fixes:

Fixes #?

How to test changes / Special notes to the reviewer:

Checklist

• Documentation update is required by this PR (and has been updated) OR no documentation update is required.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 36.54588% with 823 lines in your changes missing coverage. Please review.

Project coverage is 46.17%. Comparing base (c29e0dc) to head (262d0e2).

Files with missing lines	Patch %	Lines
cmd/principal/main.go	0.00%	93 Missing ⚠️
principal/server.go	14.94%	68 Missing and 6 partials ⚠️
agent/inbound.go	10.25%	70 Missing ⚠️
internal/resourceproxy/resourceproxy.go	55.20%	53 Missing and 3 partials ⚠️
internal/resourceproxy/options.go	32.46%	50 Missing and 2 partials ⚠️
cmd/cmdutil/log.go	0.00%	51 Missing ⚠️
internal/event/event.go	7.54%	49 Missing ⚠️
internal/argocd/cluster/informer.go	42.50%	34 Missing and 12 partials ⚠️
principal/resource.go	58.92%	37 Missing and 9 partials ⚠️
internal/resourceproxy/tracking.go	0.00%	34 Missing ⚠️
... and 20 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #267      +/-   ##
==========================================
- Coverage   48.19%   46.17%   -2.03%     
==========================================
  Files          55       73      +18     
  Lines        5054     6268    +1214     
==========================================
+ Hits         2436     2894     +458     
- Misses       2420     3118     +698     
- Partials      198      256      +58     

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