refactor(metadata): improve the stm update method

[numinnex]

Adds the ability for fn apply() method from State and StateMachine to return an error.

[codecov]

Codecov Report

❌ Patch coverage is 60.00000% with 8 lines in your changes missing coverage. Please review.
✅ Project coverage is 68.30%. Comparing base (78ef2b9) to head (6d2c3b2).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
core/metadata/src/stm/mod.rs	45.45%	5 Missing and 1 partial ⚠️
core/metadata/src/stm/mux.rs	77.77%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2757      +/-   ##
============================================
- Coverage     68.32%   68.30%   -0.03%     
  Complexity      656      656              
============================================
  Files           741      741              
  Lines         62158    62162       +4     
  Branches      58571    58575       +4     
============================================
- Hits          42472    42459      -13     
- Misses        17577    17592      +15     
- Partials       2109     2111       +2     

Flag	Coverage Δ
rust	69.36% <60.00%> (-0.03%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
core/metadata/src/stm/mux.rs	91.35% <77.77%> (-1.05%)	⬇️
core/metadata/src/stm/mod.rs	48.00% <45.45%> (+1.42%)	⬆️

... and 6 files with indirect coverage changes

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