feat: introduce v2 apiversion

[tao12345666333]

Signed-off-by: Jintao Zhang zhangjintao9020@gmail.com

Type of change:

• Bugfix
• New feature provided
• Improve performance
• Backport patches

What this PR does / why we need it:

follow #707

I want to split the task of introducing the v2 API version into multiple PRs for easy review.

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 #939 (ea20e25) into master (75098d1) will increase coverage by 0.99%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##           master     #939      +/-   ##
==========================================
+ Coverage   31.90%   32.90%   +0.99%     
==========================================
  Files          72       73       +1     
  Lines        7899     7662     -237     
==========================================
+ Hits         2520     2521       +1     
+ Misses       5103     4865     -238     
  Partials      276      276              

Impacted Files	Coverage Δ
pkg/api/validation/apisix_consumer.go	0.00% <ø> (ø)
pkg/api/validation/apisix_route.go	24.59% <ø> (+2.85%)	⬆️
pkg/api/validation/apisix_tls.go	0.00% <ø> (ø)
pkg/api/validation/apisix_upstream.go	0.00% <ø> (ø)
pkg/config/config.go	64.64% <ø> (ø)
pkg/ingress/apisix_route.go	0.00% <0.00%> (ø)
pkg/ingress/compare.go	0.00% <0.00%> (ø)
pkg/ingress/controller.go	0.95% <ø> (+<0.01%)	⬆️
pkg/ingress/namespace.go	0.00% <0.00%> (ø)
pkg/ingress/status.go	0.00% <ø> (ø)
... and 5 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update cb45119...ea20e25. Read the comment docs.