feat: add envoyproxy status

[zirain]

This's the first part of implement envoyproxy status, set EnvoyProxy status when it's invalid.
We may want to remove the one on Gateway/GatewayClass in the next step.

[netlify]

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Name	Link
🔨 Latest commit	8ddd7d2
🔍 Latest deploy log	https://app.netlify.com/projects/cerulean-figolla-1f9435/deploys/69b3ad2d704d8100080ffa80

[codecov]

Codecov Report

❌ Patch coverage is 93.87755% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 74.23%. Comparing base (01f43e3) to head (8ddd7d2).

Files with missing lines	Patch %	Lines
internal/provider/kubernetes/controller.go	50.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8475      +/-   ##
==========================================
+ Coverage   74.16%   74.23%   +0.06%     
==========================================
  Files         242      243       +1     
  Lines       37603    37645      +42     
==========================================
+ Hits        27889    27946      +57     
+ Misses       7773     7759      -14     
+ Partials     1941     1940       -1     

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