1.0 release

[thanethomson]

With the current restructuring in Tendermint, where tendermint/tendermint#9091 will result in v0.35 and v0.36 being skipped and going straight to v0.37 (which will be based on v0.34), there are a couple of things we need to do here to update tendermint-rs:

• Create a new main branch off of v0.23.x as v0.37 will be based on Tendermint v0.34
• Porting relevant PRs from master to main:
  • abci: Port domain types across from master to main #1187
• meta: Semantic versioning #1128

Having tendermint-rs support multiple versions of Tendermint Core will allow us to:

1. Cut a 1.0 release of tendermint-rs and start using semantic versioning properly
2. Simplify the development process (simple trunk-based development)
3. Keep the current crates' names as-is

[hdevalence]

The ABCI domain types should be on the list of PRs that need to be ported to main; not having those blocks us from rolling back to 0.34.

[james-chf]

For developing against Tendermint v0.37, would HEAD of main branch be the best thing to track for the time being?