chore: refactor API in package cipher for easier dependency injection

[alnr]

Towards https://github.com/ory-corp/cloud/issues/6613

[codecov]

Codecov Report

Attention: Patch coverage is 88.23529% with 2 lines in your changes missing coverage. Please review.

Project coverage is 78.51%. Comparing base (3215792) to head (ab14d61).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
driver/registry_default.go	33.33%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4103      +/-   ##
==========================================
- Coverage   79.00%   78.51%   -0.49%     
==========================================
  Files         377      376       -1     
  Lines       27492    26755     -737     
==========================================
- Hits        21720    21007     -713     
+ Misses       4165     4148      -17     
+ Partials     1607     1600       -7     

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