feat(contracts): collect validator registration fee

[sebastijankuzner]

Summary

Collect validators fee on validator registration. Fee, can be set via milestone. Fee is returned to validator if validator resigns.

Checklist

• Tests (if necessary)
• Ready to be merged

[codecov]

Codecov Report

Attention: Patch coverage is 75.23810% with 26 lines in your changes missing coverage. Please review.

Project coverage is 50.45%. Comparing base (4de3046) to head (ce76a99).
Report is 11 commits behind head on develop.

Files with missing lines	Patch %	Lines
packages/evm-consensus/source/index.ts	0.00%	14 Missing ⚠️
packages/evm-consensus/source/deployer.ts	0.00%	7 Missing ⚠️
...nsus/source/services/consensus-contract-service.ts	0.00%	4 Missing ⚠️
...ration-generator/source/configuration-generator.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #970      +/-   ##
===========================================
+ Coverage    50.25%   50.45%   +0.20%     
===========================================
  Files         1112     1112              
  Lines        60076    60211     +135     
  Branches      1458     1476      +18     
===========================================
+ Hits         30190    30379     +189     
+ Misses       29848    29794      -54     
  Partials        38       38              

Flag	Coverage Δ
contracts	98.63% <100.00%> (-0.86%)	⬇️
packages	50.10% <36.58%> (+0.17%)	⬆️

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

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.