[flags] Generic resolve method

[typotter]

What does this PR do?

A brief description of the change being made with this pull request.

Motivation

What inspired you to submit this pull request?

Additional Notes

Anything else we should know when reviewing?

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Make sure you discussed the feature or bugfix with the maintaining team in an Issue
• Make sure each commit and the PR mention the Issue number (cf the CONTRIBUTING doc)

[codecov-commenter]

Codecov Report

❌ Patch coverage is 83.24324% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 70.77%. Comparing base (740290d) to head (be2f0e8).
⚠️ Report is 34 commits behind head on feature/feature-flagging.

Files with missing lines	Patch %	Lines
.../flags/featureflags/internal/DatadogFlagsClient.kt	84.17%	9 Missing and 10 partials ⚠️
...ags/internal/persistence/FlagsStateDeserializer.kt	77.14%	8 Missing ⚠️
...oid/flags/featureflags/internal/NoOpFlagsClient.kt	0.00%	4 Missing ⚠️

Additional details and impacted files

@@                     Coverage Diff                      @@
##           feature/feature-flagging    #2923      +/-   ##
============================================================
+ Coverage                     70.69%   70.77%   +0.08%     
============================================================
  Files                           834      836       +2     
  Lines                         30378    30491     +113     
  Branches                       5131     5162      +31     
============================================================
+ Hits                          21474    21579     +105     
- Misses                         7444     7447       +3     
- Partials                       1460     1465       +5     

Files with missing lines	Coverage Δ
.../datadog/android/flags/featureflags/FlagsClient.kt	37.36% <ø> (ø)
...reflags/internal/model/PrecomputedFlagConstants.kt	100.00% <100.00%> (ø)
.../android/flags/internal/ExposureEventsProcessor.kt	100.00% <100.00%> (ø)
...adog/android/flags/internal/model/ExposureEvent.kt	100.00% <100.00%> (ø)
...roid/flags/internal/net/ExposuresRequestFactory.kt	100.00% <100.00%> (ø)
...lags/internal/storage/ExposureEventRecordWriter.kt	100.00% <100.00%> (ø)
...otlin/com/datadog/android/flags/model/ErrorCode.kt	100.00% <100.00%> (ø)
...m/datadog/android/flags/model/ResolutionDetails.kt	100.00% <100.00%> (ø)
...oid/flags/featureflags/internal/NoOpFlagsClient.kt	69.57% <0.00%> (-14.65%)	⬇️
...ags/internal/persistence/FlagsStateDeserializer.kt	84.21% <77.14%> (-0.27%)	⬇️
... and 1 more

... and 39 files with indirect coverage changes

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