Add GatewayControllerName field to Contour CRD

[sunjayBhatia]

• add field we need for properly configuring Contour when we remove Gateway API controllers from Operator
• once we start using it, mark GatewayClassRef as deprecated
• GatewayClassRef can be removed in a future API revision/in Contour config CRD when that comes about

[codecov[bot]]

Codecov Report

Merging #421 (40e01a0) into main (60e06bc) will decrease coverage by 1.29%. The diff coverage is n/a.

:exclamation: Current head 40e01a0 differs from pull request most recent head b1cff75. Consider uploading reports for the commit b1cff75 to get more accurate results

@@            Coverage Diff             @@
##             main     #421      +/-   ##
==========================================
- Coverage   72.48%   71.18%   -1.30%     
==========================================
  Files          35       35              
  Lines        2700     2700              
==========================================
- Hits         1957     1922      -35     
- Misses        598      633      +35     
  Partials      145      145              

Impacted Files	Coverage Δ
internal/status/status.go	59.45% <0.00%> (-24.33%)	:arrow_down:
internal/objects/contour/finalizer.go	62.50% <0.00%> (-18.75%)	:arrow_down:
internal/controller/contour/controller.go	57.14% <0.00%> (-12.99%)	:arrow_down:
internal/objects/contour/contour.go	82.55% <0.00%> (-3.49%)	:arrow_down:

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