Create Execution Data endpoint in AN GRPC

[koko1123]

Description

As a stopgap for removing DPS's dependency on the GCP bucket, we're going to use a staked AN as it's primary data source for the execution state.

Definition of Done

Create a new GRPC API that accepts block_height and returns a, Execution Data object to consume. the object defintion can be found in module/executiondatasync/execution_data/execution_data.go

Testing

Ensure that the API returns only the execution data object for the given block height, and all chunks of the data are included in the response.