/new/proposal form loads if chain data not loaded yet

[mhagel]

Link to Issue

Closes: #3988

Description of Changes

• Inits chain if API not loaded yet on new proposal page
• reusable useInitChain hook

Test Plan

• ran proposals.spec.ts e2e tests
• CA (click around) tested on local:
  • http://localhost:8080/evmos/new/proposal shows "Feature not supported yet for this community"
    • loads on direct url
    • loads from "Create onchain proposal" click
  • repeat for any other chain: loads Proposal form
  • Click around between multiple communities in sidebar
    • sometimes click to Proposals first
    • sometimes click to New Onchain Proposal first

Deployment Plan

Other Considerations

• Evmos still won't be able to create proposals. That is a separate ticket. We haven't supported it yet.
• Found an intermittent bug that exists in master, so ticketing separate: Handle Intermittent tendermint client API failure #4038

[jnaviask]

Would love to know some constraints around when this hook is safe to use. Will it cause race conditions if e.g. app.chain is undefined? We should also document on the hook itself how to determine when it's complete & update dependent components.

[mhagel]

Would love to know some constraints around when this hook is safe to use. Will it cause race conditions if e.g. app.chain is undefined? We should also document on the hook itself how to determine when it's complete & update dependent components.

@jnaviask
Added a new check for app.preloadingChain, and documented on the hook how it works.

Also added evmos "not supported" message per this discussion:
https://commonxyz.slack.com/archives/C051XFN57FT/p1684858677872149?thread_ts=1684779785.894519&cid=C051XFN57FT

[jnaviask]

Looks like it still triggers a double init despite the hasFetched ref.

[mhagel]

Looks like it still triggers a double init despite the hasFetched ref.

I removed the cleanup function. This was resetting the ref when I didn't expect it to. Now just running once.

Also removed the check for preloading. Not needed.

[jnaviask]

@mhagel Ian added a new chain init call in #4138 -- can you update this PR to include it, and then we can merge?