Add ECDSA support for importing private key from PEM

[mrsuciu]

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[romanett]

Does Edwards curve need to be added here?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 0.00%. Comparing base (760bfd9) to head (e1dba27).
Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #2941       +/-   ##
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- Coverage   55.44%       0   -55.45%     
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  Files         352       0      -352     
  Lines       67640       0    -67640     
  Branches    13861       0    -13861     
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- Hits        37504       0    -37504     
+ Misses      26028       0    -26028     
+ Partials     4108       0     -4108     

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[romanett]

@mrsuciu can you upate the method CertificateFactory.CreateCertificateWithPEMPrivateKey to support both RSA and ECC.

With this method adatapter & #2817merged ECC is ready and passes all my ECC GDS Tests (.net9).

I can approve once tests are fixed.