Restruct pkg/ingress

[lingsamuel]

Type of change:

• Refactor

What this PR does / why we need it:

Part of #1058

Submit PR for CI, I will update the changes later

This is a huge PR, so I will describe the changes and ideas in detail.

• This PR is expected to be merged in 1.16, so I delete the apisix-route-version option. If this option should be kept for more versions, I will restore it.

• This PR splits pkg/ingress into multiple providers, including apisix, ingress and k8s, and gateway-api was also split in a previous PR.

  • Controllers are no longer dependent on the parent controller. If a controller needs data held by other controllers, the data should be exposed by their provider interface. (See NamespaceProvider and PodProvider)
  • There are separate translators for "apisix" and "ingress". Since this PR doesn't change any detailed translation logic, ingress translator depends on apisix translator for now.
  • The CRD controllers handle own status records instead of using the shared type-switch function.
  • Some shared variables, such as MetricsCollector, KubeClient, and config, are embedded by commonConfig.

• If the E2E_ENV is not ci, replace ingress-controller deployment yaml imagePullPolicy to Always.

Pre-submission checklist:

• Did you explain what problem does this PR solve? Or what new features have been added?
• Have you added corresponding test cases?
• Have you modified the corresponding document?
• Is this PR backward compatible? If it is not backward compatible, please discuss on the mailing list first

[codecov-commenter]

Codecov Report

Merging #1204 (5b89467) into master (cccad72) will increase coverage by 13.09%.
The diff coverage is 31.47%.

@@             Coverage Diff             @@
##           master    #1204       +/-   ##
===========================================
+ Coverage   29.55%   42.64%   +13.09%     
===========================================
  Files          81       73        -8     
  Lines       10166     6462     -3704     
===========================================
- Hits         3005     2756      -249     
+ Misses       6834     3409     -3425     
+ Partials      327      297       -30     

Impacted Files	Coverage Δ
cmd/ingress/ingress.go	78.64% <ø> (-0.41%)	⬇️
pkg/config/config.go	65.00% <ø> (-0.35%)	⬇️
...viders/apisix/translation/apisix_cluster_config.go	50.00% <ø> (ø)
...kg/providers/apisix/translation/apisix_consumer.go	67.74% <ø> (ø)
pkg/providers/apisix/translation/apisix_ssl.go	0.00% <0.00%> (ø)
pkg/providers/apisix/translation/translator.go	0.00% <0.00%> (ø)
pkg/providers/gateway/translation/gateway.go	0.00% <ø> (ø)
.../providers/gateway/translation/gateway_tlsroute.go	0.00% <0.00%> (ø)
pkg/providers/gateway/translation/translator.go	0.00% <ø> (ø)
pkg/providers/ingress/provider.go	0.00% <0.00%> (ø)
... and 40 more

Help us with your feedback. Take ten seconds to tell us how you rate us.

[tao12345666333]

LGTM

let's move forward

[tao12345666333]

just a question, why do we put it here, is it a generic method?