Rework sync/async

[baraline]

Rework sync/async usage by adding an async bridge to replace previous transport layer. We were using threads in the transport layer anyway, so I'd rather have the sync implementation as source of truth, dispacthed as async function by the async bridge. This avoids code duplication.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.97%. Comparing base (c593368) to head (548f01c).
⚠️ Report is 5 commits behind head on main.
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Additional details and impacted files

@@            Coverage Diff             @@
##             main       #8      +/-   ##
==========================================
+ Coverage   95.19%   96.97%   +1.78%     
==========================================
  Files          57       61       +4     
  Lines        1601     1718     +117     
==========================================
+ Hits         1524     1666     +142     
+ Misses         77       52      -25     

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