Aptos Indexer GRPC on Fullnode

This opens a GRPC endpoint on the indexer. A client (e.g. worker) connects to the endpoint and makes a request. The GRPC endpoint would maintain a stream and sends transactions back to the client on a batch basis. Note that transactions within a batch may be out of order.

TBD architecture diagram. Also link to dev docs

Local testing

1) Run the fullnode

Against an existing network

Follow instructions on how to run a fullnode against an existing network.

Get genesis, waypoint, and fullnode.yaml

Add following to fullnode.yaml

indexer_grpc:
  enabled: true
  address: 0.0.0.0:50051
  processor_task_count: 10
  processor_batch_size: 100
  output_batch_size: 100```

Run fullnode cargo run -p aptos-node --release -- -f ./fullnode.yaml

2) Test with GCURL

Install grpcurl (https://github.com/fullstorydev/grpcurl#installation)
From the aptos-core (base folder), test with grpcurl: grpcurl -max-msg-sz 10000000 -d '{ "starting_version": 0 }' -import-path crates/aptos-protos/proto -proto aptos/internal/fullnode/v1/fullnode_data.proto -plaintext 127.0.0.1:50051 aptos.internal.fullnode.v1.FullnodeData/GetTransactionsFromNode