Support of aggregate signatures (AEIP-24)

[samuelmanzanera]

Describe the area

Coming from the AEIP-24, to have a secure and cost efficient transaction's consensus and trust, we have to implement aggregated signature into transaction and mining.

We could divide this implementation into subtasks:

Tasks

Beta Give feedback

1. Support BLS signature scheme #1519
   crypto feature +2
2. Update node's transaction to support BLS's public key publication #1542
   P2P feature +2
3. Leverage BLS aggregated signatures for cross validation stamps #1543
   feature mining +2
4. Leverage BLS aggregated signatures for replication's signatures #1544
   feature mining replication +3
5. Update the transaction's structure to include the aggregated signatures from replication nodes and cross validation nodes #1545
   DB feature +2