feat: support importing more credentials

[aeneasr]

Adds support to import SAML credentials. SAML connections are only available in Ory Enterprise License / Ory Network.

[hperl]

LGTM! I would just not make the SAML doc strings reference OIDC, since that would be an implementation detail.

[codecov]

Codecov Report

Attention: Patch coverage is 90.69767% with 4 lines in your changes missing coverage. Please review.

Project coverage is 78.60%. Comparing base (5f47ac4) to head (79aeddf).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
identity/handler_import.go	90.69%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4361      +/-   ##
==========================================
+ Coverage   78.56%   78.60%   +0.04%     
==========================================
  Files         366      366              
  Lines       27168    27206      +38     
==========================================
+ Hits        21344    21385      +41     
+ Misses       4198     4192       -6     
- Partials     1626     1629       +3     

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[aeneasr]

Code doc addressed!