feat:(dex) allow dex storage to be configured #7089

[IanMoroney]

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this does not need to be in the release notes.
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Closes #7089

This PR allows for different storage options to be presented to the Dex config, and if no storage option is given, reverts to the current in-memory storage.

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[IanMoroney]

I'd be happy to include some documentation for this to indicate that this is now possible, i'll just need a steer on where I should put that documentation.

[codecov]

Codecov Report

Attention: Patch coverage is 78.94737% with 4 lines in your changes missing coverage. Please review.

Project coverage is 55.95%. Comparing base (38b4cba) to head (29a99d0).
Report is 6 commits behind head on master.

Files with missing lines	Patch %	Lines
util/dex/config.go	78.94%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #22559      +/-   ##
==========================================
- Coverage   56.06%   55.95%   -0.12%     
==========================================
  Files         343      343              
  Lines       57527    57544      +17     
==========================================
- Hits        32251    32197      -54     
- Misses      22635    22694      +59     
- Partials     2641     2653      +12     

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[IanMoroney]

@crenshaw-dev , any feedback on this if possible?