feat: index outbound exchange messages

[iFergal]

The ExchangeCueDoer is hooked up to our 3902 parser so that any successfully parsed and saved exchanges get indexed in the DB afterwards.

This PR hooks up the Exchanger to the parsing call in /identifiers/{name}/exchanges so that the same happens for outbound exchanges.

This means we can properly find exns we have sent using /exchanges/query (this exists in KERIA but not Signify - we are using it on our Signify fork).

@lenkan On main this doesn't need to be applied to IPEX as it's using parser instead of hby.psr but you reverted that in your PR. Once we have aligned on how to handle that there, we can consolidate everything.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.89%. Comparing base (1f22907) to head (838775c).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #401      +/-   ##
==========================================
+ Coverage   86.60%   86.89%   +0.29%     
==========================================
  Files          25       25              
  Lines        5286     5442     +156     
==========================================
+ Hits         4578     4729     +151     
- Misses        708      713       +5     

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[kentbull]

looks good to me

[kentbull]

This also needs to be rebased.

[kentbull]

This is failing due to the macos-13 requirement. You can just change that to macos-15 and rerun.

[kentbull]

After a rebase this one can be quickly merged.