Review and ensure metadata is correctly set and transport

Expected Behavior

metadata should be correctly set and passed to dapr.

At first, in state save method, there is no metadata to set.

See file src/main/java/io/dapr/client/domain/State.java

I will submit a PR for this and later check other processes.

RELEASE NOTE: RESOLVED validated handling of metadata and fixed when applicable.

@artursouza

@artursouza Another PR has raised to add metadata parameter in get bulk request which is missing in java sdk.

Please help to review. And now I only updated the grpc api.

For HTTP API, should we also support metadata in get bulk request (and also there is a ongoing PR to add metadata in get/bulk get response)?

@artursouza

@artursouza A new more PR for metadata just raised.

@skyao

@skyao Thanks a lot. I will review the PR. Please, keep feature parity for the GRPC and HTTP clients for Dapr.

I am handling all the remaining metadata logic in the PR above.