feat(keymanager): add encrypt ephemeral resource

[estellesoulard]

Depends on #3538

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 106 lines in your changes missing coverage. Please review.
✅ Project coverage is 1.70%. Comparing base (6900a12) to head (6c826f0).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
.../services/keymanager/encrypt_ephemeral_resource.go	0.00%	101 Missing ⚠️
provider/framework.go	0.00%	4 Missing ⚠️
...al/services/keymanager/action_rotate_key_action.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##           master   #3539      +/-   ##
=========================================
- Coverage    1.71%   1.70%   -0.01%     
=========================================
  Files         434     435       +1     
  Lines       47517   47621     +104     
=========================================
- Hits          813     811       -2     
- Misses      46616   46721     +105     
- Partials       88      89       +1     

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