[meta] explore rpc-relayer

[extraymond]

Info

description:
This is the meta issue collecting how and what needs to be done to provide a rpc-relayer.
for chains that are not directly building eth-style blocks, an alternative approach would be providing a rpc-relayer to specifically allow services to request and responds in ethereum fashion. For example Acala with https://github.com/AcalaNetwork/bodhi.js

workable items:

• document version of the set of rpc's provided, for example legacy request vs post EIP-1559 requests
• compatible matrix of rpcs needed for prominent tools under different rpc sets, such as remix and metamask,
• document the architecture for the relayer, for example indexer, relayer, runtime modules
• needed modification on the subquery query plan
• proposal for needed changes on existing bodhi.js code base
• proposal for needed changes on laguna-runtime

[extraymond]

@ayudh37