Lotus exposes F3-aware RPCs

[BigLep]

Done Criteria

1. Lotus exposes APIs that are "F3-aware", in all these groups:

   • Eth
   • Non-Eth
     • Chain
     • F3
     • State

2. This should be done without breaking/changing existing versions. Using "F3-aware" APIs should be deliberate (opt-in) and viewed as experimental at this point.

Why Important

Enables application builders and integraters (e.g., exhanges, bridges) to take advantage of fast finality.

Notes

1. This is intended to be an over-arching tracking issue with various subtasks.
2. There are two tracks here: ETH and non-ETH. This is because the ETH side is clear-cut but the non-ETH side is has more design exploration to do.

[BigLep]

Issue description to make clear the two tracks:

• ETH
• non-ETH (e.g., Chain, F3, State)

[BigLep]

@masih : I created https://www.notion.so/filecoindev/Lotus-F3-aware-APIs-1cfdc41950c180ae97fef580e79427d5 in case we need a place to work outside of Lotus for API documentation for getting user feedback.

Note: https://www.notion.so/filecoindev/Filecoin-V2-APIs-1d0dc41950c1808b914de5966d501658 is where the meat is.