feat: set mgr to interface

[Xunzhuo]

Resolve: #182

Since this is a backlog issue, I will work on this after releasing v0.2.0.

Signed-off-by: bitliu [email protected]

[codecov-commenter]

Codecov Report

Merging #530 (468db87) into main (b8f234b) will decrease coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #530      +/-   ##
==========================================
- Coverage   62.72%   62.61%   -0.12%     
==========================================
  Files          42       42              
  Lines        4496     4496              
==========================================
- Hits         2820     2815       -5     
- Misses       1532     1536       +4     
- Partials      144      145       +1     

Impacted Files	Coverage Δ
internal/infrastructure/kubernetes/infra.go	50.00% <100.00%> (ø)
internal/provider/kubernetes/gatewayclass.go	67.39% <0.00%> (-3.63%)	⬇️

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[LukeShu]

Looks OK to me, but I know that @danehans was hesitant to create an interface until we had a second provider to have an idea of what things might need to be different between providers.

[Xunzhuo]

Thanks for this comment @LukeShu, yes, so this can wait until we got another provider, and we can do better abstraction.

[arkodg]

should be fine to get this in, and iterate, thanks for adding this @Xunzhuo