Move app/signing into factors/signatures-collector

[micbakos-rdx]

Signing crate includes signatures-collector . It could be inside factors instead of app as is keys-collector, since it is an internal api.

Created a separate PR not to litter any other PR with many changes.

[CyonAlexRDX]

LGTM - in future prefer bumping version after PR approval, makes review a bit easier :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.59%. Comparing base (9ca1867) to head (d3c707d).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #359   +/-   ##
=======================================
  Coverage   92.59%   92.59%           
=======================================
  Files        1170     1170           
  Lines       26248    26248           
  Branches       81       81           
=======================================
  Hits        24305    24305           
  Misses       1932     1932           
  Partials       11       11           

Flag	Coverage Δ
kotlin	97.73% <ø> (ø)
rust	92.20% <ø> (ø)
swift	93.03% <ø> (ø)

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