feat(key_manager): add sign and verify methods

[scaleway-bot]

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[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.

Project coverage is 55.18%. Comparing base (5bf53e0) to head (d51b195).
Report is 615 commits behind head on master.

Files with missing lines	Patch %	Lines
...namespaces/key_manager/v1alpha1/key_manager_cli.go	0.00%	31 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (5bf53e0) and HEAD (d51b195). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (5bf53e0)	HEAD (d51b195)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4713       +/-   ##
===========================================
- Coverage   75.45%   55.18%   -20.27%     
===========================================
  Files         202      311      +109     
  Lines       44323    79287    +34964     
===========================================
+ Hits        33444    43757    +10313     
- Misses       9653    34126    +24473     
- Partials     1226     1404      +178     

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