remove annotation for apiversion and kind, use discoverymapper instead

[wonderflow]

fix #572
Signed-off-by: 天元 jianbo.sjb@alibaba-inc.com

[hongchaodeng]

lgtm

[hongchaodeng]

UT failure:

pkg/server/handler/capabilityHandlers.go:46:42: not enough arguments in call to "github.com/oam-dev/kubevela/pkg/oam".AddCapabilityIntoCluster
	have (client.Client, string)
	want (client.Client, discoverymapper.DiscoveryMapper, string)

[resouer]

Please update the extending kubevela doc.

[wonderflow]

@resouer already updated

[codecov]

Codecov Report

Merging #584 (4f4210f) into master (16ddba8) will increase coverage by 0.21%.
The diff coverage is 17.28%.

@@            Coverage Diff             @@
##           master     #584      +/-   ##
==========================================
+ Coverage   17.72%   17.94%   +0.21%     
==========================================
  Files          61       61              
  Lines        5240     5245       +5     
==========================================
+ Hits          929      941      +12     
+ Misses       4168     4157      -11     
- Partials      143      147       +4     

Flag	Coverage Δ
unittests	17.94% <17.28%> (+0.21%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
pkg/commands/capability.go	0.00% <0.00%> (ø)
pkg/commands/dashboard.go	0.00% <0.00%> (ø)
pkg/commands/env.go	29.56% <0.00%> (ø)
pkg/commands/refresh.go	0.00% <ø> (ø)
pkg/commands/system.go	0.00% <0.00%> (ø)
pkg/commands/traits.go	28.57% <0.00%> (+2.76%)	⬆️
pkg/commands/util/helpers.go	0.00% <ø> (ø)
pkg/commands/workloads.go	0.00% <0.00%> (ø)
pkg/oam/capability.go	0.00% <0.00%> (ø)
pkg/oam/common.go	33.33% <0.00%> (-3.04%)	⬇️
... and 2 more

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