feat: fast add credential type lookups

[aeneasr]

Related issue(s)

Checklist

• I have read the contributing guidelines.
• I have referenced an issue containing the design document if my change
  introduces a new feature.
• I am following the
  contributing code guidelines.
• I have read the security policy.
• I confirm that this pull request does not address a security
  vulnerability. If this pull request addresses a security vulnerability, I
  confirm that I got the approval (please contact
  [email protected]) from the maintainers to push
  the changes.
• I have added tests that prove my fix is effective or that my feature
  works.
• I have added or changed the documentation.

Further Comments

[codecov]

Codecov Report

Attention: Patch coverage is 90.12346% with 8 lines in your changes missing coverage. Please review.

Project coverage is 78.61%. Comparing base (b4c453b) to head (ad4e21f).
Report is 3 commits behind head on master.

Files with missing lines	Patch %	Lines
persistence/sql/identity/persister_identity.go	84.21%	3 Missing and 3 partials ⚠️
x/sync_map.go	93.10%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4177      +/-   ##
==========================================
+ Coverage   78.57%   78.61%   +0.04%     
==========================================
  Files         379      380       +1     
  Lines       27042    27100      +58     
==========================================
+ Hits        21249    21306      +57     
+ Misses       4181     4180       -1     
- Partials     1612     1614       +2     

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