Bug/skaled 1745 invalid fork in pow gas

[dimalit]

Changes:
1 Transaction::checkOutExternalGas() now operates on current Ethereum fork, instead of Constantinople (base gas for 1 byte of data changed from 68 gas/b to 16 gas/b)
2 All changes are activated after correctForkInPowPatchTimestamp. This is true both for external gas check and for eth_estimateGas call.
3 Transaction::checkOutExternalGas() is called one additional time after consensus (needed to be sure that patch activates smoothly). This make possible little decrease of block processing performance (but unlikely).

Testing:
JsonRpcSuite/simplePoWTransaction tests that PoW transaction with incorrect amount of gas fails before patch timestamp and works after it

[github-actions]

SUGGESTIONS BEFORE MERGE:

1. Build custom container here: https://github.com/skalenetwork/skaled/actions?query=workflow%3A%22Custom+Docker+and+Binary%22
2. Test it here: https://github.com/skalenetwork/skale-ci-integration_tests/actions?query=workflow%3A%22Skaled+Nightly+Tests%22
3. Edit VERSION file appropriately to your changes!
   See https://skalelabs.atlassian.net/wiki/spaces/SKALE/pages/2444951553/Branching+instructions

[codecov]

Codecov Report

Attention: 37 lines in your changes are missing coverage. Please review.

Comparison is base (6183faf) 45.52% compared to head (a93c503) 45.56%.
Report is 13 commits behind head on v3.18.0.

❗ Current head a93c503 differs from pull request most recent head 9f1de09. Consider uploading reports for the commit 9f1de09 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           v3.18.0    #1768      +/-   ##
===========================================
+ Coverage    45.52%   45.56%   +0.04%     
===========================================
  Files          356      358       +2     
  Lines        51709    51807      +98     
===========================================
+ Hits         23542    23608      +66     
- Misses       28167    28199      +32     

[DmytroNazarenko]

1. Please, add patch timestamp to estimateGas
2. Update description with details about new patch timestamp