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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