[feature] #3168: Provide genesis validator in separate file

[Erigara]

Description

Add ability to provide validator in separate file not inlined in genesis.

Linked issue

Closes #3168

Benefits

Genesis isn't overloaded with inlined validator.

Checklist

• I've read CONTRIBUTING.md
• I've used the standard signed-off commit format (or will squash just before merging)
• All applicable CI checks pass (or I promised to make them pass later)
• (optional) I've written unit tests for the code changes
• I replied to all comments after code review, marking all implemented changes with thumbs up

[codecov]

Codecov Report

Merging #3434 (4b08df8) into iroha2-dev (a4d5c9f) will decrease coverage by 5.97%.
The diff coverage is 46.52%.

@@              Coverage Diff               @@
##           iroha2-dev    #3434      +/-   ##
==============================================
- Coverage       62.33%   56.37%   -5.97%     
==============================================
  Files             169      158      -11     
  Lines           31218    29755    -1463     
==============================================
- Hits            19459    16773    -2686     
- Misses          11759    12982    +1223     

Impacted Files	Coverage Δ
cli/src/lib.rs	0.58% <0.00%> (-68.85%)	⬇️
cli/src/main.rs	0.66% <0.00%> (-0.44%)	⬇️
cli/src/samples.rs	0.00% <0.00%> (-61.85%)	⬇️
cli/src/style.rs	0.00% <0.00%> (ø)
cli/src/torii/mod.rs	0.00% <0.00%> (-27.66%)	⬇️
cli/src/torii/routing.rs	0.00% <0.00%> (-57.11%)	⬇️
cli/src/torii/utils.rs	0.00% <0.00%> (-84.85%)	⬇️
client/src/http_default.rs	0.00% <0.00%> (-38.94%)	⬇️
client_cli/src/main.rs	0.25% <0.00%> (+<0.01%)	⬆️
config/base/src/lib.rs	95.08% <ø> (+58.71%)	⬆️
... and 100 more

... and 51 files with indirect coverage changes