feat(HIP-991): Permissionless revenue - Generating Topic Ids for Topic Operators

[gsstoykov]

Description:

This HIP introduces new transactions and updates to existing transactions in the consensus node software. SDKs will need to support these new transactions and updates to existing ones so that developers can take advantage of the new features.

• Implementation
• Unit tests
• E2E tests
• Example

Also introduced setTestClientOperator, setDefaultTestClientOperator functions to BaseIntegration.

Related issue(s):

Fixes #750

Notes for reviewer:

• Unit tests had to be reworked to include transaction.pb.h as transaction_body.pb.h was deleted.
• AccountStakersQuery has been dropped from consensus support.

Checklist

• Documented (Code comments, README, etc.)
• Tested (unit, integration, etc.)

[rwalworth]

I believe for now, since TopicMessageSubmitTransaction is the only transaction that uses this value, we were going to implement these functions there.

[gsstoykov]

The custom_fee_limits defined in the protobufs belongs to transaction.proto https://github.com/hashgraph/hedera-protobufs/blob/c0ca3524f2e80e5d5e545e36fcb5d23d64c31fb5/services/transaction.proto and has no corresponding entry in consensus_submit_message.proto. I'm guessing this is decided for further extendability as some other transaction might benefit from the functionality. If I work around the implementation to be explicitly present in TopicSubmitMessage maybe this would have to be reworked at some future point.