RTA Mining: Import new Stake Tx and Auth Sample selection mechanism. Testing

[Dju01]

RTA Mining: Import new Stake Tx and Auth Sample selection mechanism. Testing

• GNRTA-314
• Merge PR https://github.com/graft-project/GraftNetwork/pull/210 and https://github.com/graft-project/graft-ng/pull/211 with brahcnes feature/lkholodov/stake_transaction_validation in SN and CN
• Jason edited PR https://github.com/graft-project/GraftNetwork/pull/225
• Prepared branches for testing CN and SN on the Alpha TestNetwork.
• edit https://github.com/graft-project/graft-ng/pull/204, to ensure the requirement of uniform distribution from Jason when building the auth sample