feat(full-stack signals): make operations thenable

[cromoteca]

This pull request introduces a feature to make operations "thenable", which means it implements the ability for operations to return promise-like objects that can be chained. Those objects are in the result properties to avoid the return type themselves to be treated as promises by lint checkers.

Closes #2712

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 95.65217% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.64%. Comparing base (beeccf4) to head (b8da3ba). Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
packages/ts/react-signals/src/FullStackSignal.ts	91.66%	2 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2799      +/-   ##
==========================================
+ Coverage   92.60%   92.64%   +0.03%     
==========================================
  Files          83       83              
  Lines        2812     2840      +28     
  Branches      724      728       +4     
==========================================
+ Hits         2604     2631      +27     
- Misses        156      157       +1     
  Partials       52       52              

Flag	Coverage Δ
unittests	92.64% <95.65%> (+0.03%)	:arrow_up:

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[taefi]

Also ListSignal's operations need another follow-up PR to enable the thenables, right?

[sonarqubecloud[bot]]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud