feat: curio: jsonrpc in webui

[magik6k]

Related Issues

On top of #11901

Proposed Changes

• Implement basic jsonrpc client module
  • It was easier to ask chatgpt to write this than to convince any of the existing, massively overengineered modules to work in a browser without bundlers
• Move chain-connectivity to RPC
• Todo: before or after this PR lands, move over htmx stuff to RPC, get rid of hapi

Additional Info

Checklist

Before you mark the PR ready for review, please make sure that:

• Commits have a clear commit message.
• PR title is in the form of of <PR type>: <area>: <change being made>
  • example: fix: mempool: Introduce a cache for valid signatures
  • PR type: fix, feat, build, chore, ci, docs, perf, refactor, revert, style, test
  • area, e.g. api, chain, state, market, mempool, multisig, networking, paych, proving, sealing, wallet, deps
• If the PR affects users (e.g., new feature, bug fix, system requirements change), update the CHANGELOG.md and add details to the UNRELEASED section.
• New features have usage guidelines and / or documentation updates in
  • Lotus Documentation
  • Discussion Tutorials
• Tests exist for new functionality or change in behavior
• CI is green