Add PaymasterController

[DimaStebaev]

• added PaymasterController smart contract
• sent message to Paymaster via PaymasterController during
  • an schain creation/removal
  • a node creation/removal
  • a validator creation/removal
• used efficient errors in Nodes, Schains and ValidatorService
• made all lines shorter than 100 symbols
• deleted legacy pricing
• PaymasterController is covered by existing unit tests
• upgrade procedure is tested in the script/test_upgrade.sh script

[codecov]

Codecov Report

Attention: Patch coverage is 92.12828% with 54 lines in your changes missing coverage. Please review.

Project coverage is 94.07%. Comparing base (0b319f3) to head (0332c97).

Files	Patch %	Lines
contracts/Nodes.sol	87.05%	11 Missing ⚠️
contracts/PaymasterController.sol	82.97%	8 Missing ⚠️
contracts/Schains.sol	84.61%	8 Missing ⚠️
contracts/delegation/TimeHelpers.sol	42.85%	8 Missing ⚠️
contracts/delegation/ValidatorService.sol	91.76%	7 Missing ⚠️
contracts/delegation/DelegationController.sol	97.11%	3 Missing ⚠️
contracts/delegation/PartialDifferences.sol	93.10%	2 Missing ⚠️
contracts/dkg/SkaleDkgAlright.sol	77.77%	2 Missing ⚠️
contracts/dkg/SkaleDkgPreResponse.sol	84.61%	2 Missing ⚠️
contracts/SkaleVerifier.sol	66.66%	1 Missing ⚠️
... and 2 more

Additional details and impacted files

@@             Coverage Diff             @@
##           v1.12.0    #1083      +/-   ##
===========================================
- Coverage    95.11%   94.07%   -1.05%     
===========================================
  Files           40       40              
  Lines         2865     2985     +120     
  Branches       675      691      +16     
===========================================
+ Hits          2725     2808      +83     
- Misses         140      177      +37     

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[DmytroNazarenko]

Please, add description of the tests in PR