Refactor basic crypto to not use raw pointers.

[ni4]

This PR continues work, done in PR #2292 . Unfortunately still large and non-transactional as a lot of changes must be done in once to make code compilable.

[codecov]

Codecov Report

Attention: Patch coverage is 95.80052% with 16 lines in your changes missing coverage. Please review.

Project coverage is 84.90%. Comparing base (cd9ca84) to head (16137d3).
Report is 11 commits behind head on main.

Files with missing lines	Patch %	Lines
src/lib/crypto/rsa_ossl.cpp	75.00%	7 Missing ⚠️
src/lib/key_material.cpp	87.23%	6 Missing ⚠️
src/librepgp/stream-parse.cpp	92.85%	2 Missing ⚠️
src/lib/crypto/ecdh_ossl.cpp	98.38%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2303      +/-   ##
==========================================
+ Coverage   84.88%   84.90%   +0.02%     
==========================================
  Files         114      114              
  Lines       22784    22789       +5     
==========================================
+ Hits        19340    19350      +10     
+ Misses       3444     3439       -5     

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[maxirmx]

LGTM

[maxirmx]

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