Feat: add client package

[Somefive]

Signed-off-by: Yin Da yd219913@alibaba-inc.com

[codecov]

Codecov Report

Merging #3 (807aa43) into main (c41454e) will increase coverage by 0.92%.
The diff coverage is 85.32%.

@@            Coverage Diff             @@
##             main       #3      +/-   ##
==========================================
+ Coverage   83.89%   84.81%   +0.92%     
==========================================
  Files           7       16       +9     
  Lines         118      303     +185     
==========================================
+ Hits           99      257     +158     
- Misses         14       28      +14     
- Partials        5       18      +13     

Flag	Coverage Δ
unit-test	84.81% <85.32%> (+0.92%)	⬆️

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

Impacted Files	Coverage Δ
util/runtime/caller.go	60.00% <60.00%> (ø)
controller/client/delegating_client.go	63.63% <63.63%> (ø)
monitor/context/context.go	78.04% <78.04%> (ø)
controller/client/controller_client.go	80.00% <80.00%> (ø)
util/k8s/object.go	84.61% <84.61%> (ø)
controller/client/delegating_handler_client.go	100.00% <100.00%> (ø)
controller/client/monitor_client.go	100.00% <100.00%> (ø)
util/rand/strings.go	100.00% <100.00%> (ø)
util/test/tester/client.go	100.00% <100.00%> (ø)
multicluster/context.go	100.00% <0.00%> (ø)

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