Typed backend method

[noam-honig]

• complete failing test
• support decorators for parameters of backend methods
• create a sample of static backend method vs new backend method style
• review api types

[codecov-commenter]

Codecov Report

Base: 88.24% // Head: 88.30% // Increases project coverage by +0.05% 🎉

Coverage data is based on head (5489d50) compared to base (7d467a5).
Patch coverage: 90.05% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #128      +/-   ##
==========================================
+ Coverage   88.24%   88.30%   +0.05%     
==========================================
  Files          36       36              
  Lines        3234     3351     +117     
  Branches      650      672      +22     
==========================================
+ Hits         2854     2959     +105     
- Misses        222      227       +5     
- Partials      158      165       +7     

Impacted Files	Coverage Δ
projects/core/src/server-action.ts	80.08% <85.18%> (-0.59%)	⬇️
projects/core/src/column.ts	93.67% <90.47%> (-1.99%)	⬇️
...jects/core/src/remult3/RepositoryImplementation.ts	87.35% <91.56%> (+0.39%)	⬆️
projects/core/src/remult3/DecoratorReplacer.ts	92.30% <100.00%> (+5.64%)	⬆️
projects/core/src/remult-proxy.ts	50.00% <0.00%> (+5.55%)	⬆️

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