feat: add v2beta3

[gxthrj]

Please answer these questions before submitting a pull request

• Why submit this pull request?
• Bugfix
• New feature provided
• Improve performance
• Backport patches

[codecov-commenter]

Codecov Report

Merging #746 (77ec0d0) into master (703c6b2) will decrease coverage by 0.07%.
The diff coverage is 26.60%.

@@            Coverage Diff             @@
##           master     #746      +/-   ##
==========================================
- Coverage   32.50%   32.42%   -0.08%     
==========================================
  Files          66       65       -1     
  Lines        6800     6872      +72     
==========================================
+ Hits         2210     2228      +18     
- Misses       4340     4396      +56     
+ Partials      250      248       -2     

Impacted Files	Coverage Δ
pkg/api/validation/apisix_consumer.go	0.00% <0.00%> (ø)
pkg/api/validation/apisix_route.go	21.73% <0.00%> (+2.50%)	⬆️
pkg/api/validation/apisix_tls.go	0.00% <0.00%> (ø)
pkg/api/validation/apisix_upstream.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_cluster_config.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_consumer.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_route.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_tls.go	0.00% <0.00%> (ø)
pkg/ingress/apisix_upstream.go	0.00% <0.00%> (ø)
pkg/ingress/compare.go	0.00% <ø> (ø)
... and 22 more

---

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[tokers]

Can we split this PR to two parts:

1. Add the new version;
2. Delete the old versions;

[tao12345666333]

@gxthrj any updates?

[tao12345666333]

Great Job!

LGTM! Thanks!

[tao12345666333]

ping @tokers @lingsamuel for review, thanks!