internal operations

[kroggen]

This feature:

• Records the internal operations in the node database
• Encode them as JSON string, all transactions from a block (store just once per block to reduce I/O, using the block number as key)
• Adds a RPC endpoint to retrieve these values

Currently it will log:

• calls to other contracts (contract.call)
• delegate call (contract.delegatecall)
• deploy of other contracts (contract.deploy)
• send / transfer of aergo tokens (contract.send)
• stake
• unstake
• vote
• voteDAO

The deploy and send can also trigger a call to the contract (call to the constructor and to the default function). These internal calls are also recorded

Maybe in the future (HF 5) it can also log:

• state variables (set and delete)
• db exec

[hayarobi]

All tests need to be passed.

[kroggen]

It is passing now.
There are no tests specific to this feature, though.

Note that this is not intended to be merged now. It lacks a sync test, and manual tests with the indexer.
It can be merged into develop later

[hayarobi]

lgtm