Integrate bls signature scheme

[samuelmanzanera]

Description

Add support of BLS mining public key

Note: I inserted a migration task which not run by default.
This task should be run after the upgrade have been released.

Fixes #1519
Fixes #1542

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Test have been released with multiple nodes with upgrades of nodes.
In memory table should be updated.
Starting from develop and then to this branch.

Run the migration script to create a new transaction with the mining public key

Restart tests have been made to make sure the node's transaction content decoding is backward compatible

Explorer should list the new mining public key from the node info and from the node's transaction content

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules