Update CertificateSigningRequest to v1 to support k8s v1.22+

[xxx7xxxx]

Fix #78

[zhao-kun]

Test failure, please fix it

[codecov-commenter]

Codecov Report

Merging #99 (87e1e45) into main (cb44335) will decrease coverage by 0.00%. The diff coverage is 75.00%.

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
- Coverage   79.09%   79.09%   -0.01%     
==========================================
  Files          63       63              
  Lines        5195     5199       +4     
==========================================
+ Hits         4109     4112       +3     
- Misses        845      846       +1     
  Partials      241      241              

Impacted Files	Coverage Δ
...client/command/meshinstall/operator/secret_spec.go	63.51% <50.00%> (-0.38%)	:arrow_down:
...ctl/cmd/client/command/meshinstall/operator/csr.go	71.62% <81.81%> (+0.78%)	:arrow_up:

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[xxx7xxxx]

Updated as comments