feat: add secrets service support

[jyecusch]

Closes: #29

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #31 (f3c6f04) into main (4aeca36) will increase coverage by 0.60%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #31      +/-   ##
==========================================
+ Coverage   93.25%   93.85%   +0.60%     
==========================================
  Files          15       16       +1     
  Lines         563      618      +55     
==========================================
+ Hits          525      580      +55     
  Misses         38       38              

Impacted Files	Coverage Δ
nitric/api/__init__.py	100.00% <100.00%> (ø)
nitric/api/secrets.py	100.00% <100.00%> (ø)

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[tjholm]

LGTM