feat: support plugin_metadata of apisix

[AlinsRan]

Type of change:

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

What this PR does / why we need it:

• Proposal: Add support for APISIXPluginMetadata function #1372

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

Attention: Patch coverage is 38.09524% with 156 lines in your changes missing coverage. Please review.

Project coverage is 40.43%. Comparing base (c38ae66) to head (1c39d4c).
Report is 321 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/apisix/plugin_metadata.go	4.39%	87 Missing ⚠️
pkg/providers/utils/manifest.go	54.16%	18 Missing and 4 partials ⚠️
...providers/k8s/configmap/translation/translation.go	0.00%	17 Missing ⚠️
pkg/apisix/nonexistentclient.go	9.09%	10 Missing ⚠️
pkg/apisix/resource.go	0.00%	8 Missing ⚠️
pkg/providers/k8s/configmap/translation/parse.go	55.55%	6 Missing and 2 partials ⚠️
pkg/apisix/cluster.go	94.11%	2 Missing ⚠️
...ers/k8s/configmap/translation/configyaml_parser.go	80.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1369      +/-   ##
==========================================
- Coverage   40.89%   40.43%   -0.46%     
==========================================
  Files          78       82       +4     
  Lines        7231     7436     +205     
==========================================
+ Hits         2957     3007      +50     
- Misses       3933     4081     +148     
- Partials      341      348       +7     

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