feat: streamer and member nodes

[Mikelle]

Describe your changes

Added:

• The Streamer is responsible for streaming payloads to member nodes, allowing them to apply these payloads to their respective Geth instances.
• The Member is connecting to the Streamer to receive payloads from the stream and apply them to their Geth instances

Refactored:

• Block builder
• State manager

Issue ticket number and link

Fixes #499

Checklist before requesting a review

• I have added tests that prove my fix is effective or that my feature works
• I have made corresponding changes to the documentation

[shaspitz]

We should consider alternative naming to "relay" and/or "relayer". Relay already has meaning within the mev-boost pipeline, and relayer already has meaning in our standard bridging protocol (along with other bridging protocols such as IBC)

[Mikelle]

@shaspitz Will the name PayloadStreamer work?

[shaspitz]

@shaspitz Will the name PayloadStreamer work?

SGTM!