Create integration test interface to chain's state machine from rust

[iboss-ptk]

Background

Integration testing support is needed for better testing experience since using mock in unit test doesn't mean much when performing stateful operation. It would be done by writing test in go (example) but can be tedious since we need to redefine all msg types.

This also pave path for osmosis-labs/beaker#88 and osmosis-labs/beaker#89 that beaker can reuse osmosisd logics.

Expectation

• create osmosis-testing crate
• build.rs
  • rebuild on go file change -> run go build in build.rs
  • read go file to find list of exported function
  • use bindgen, whitelist only exported function
• export basic function
  • create testing account
  • fund account
  • store-code and instantiate
  • check the state
  • execute

Further work

• Make setup intuitive
• Add more setup function, eg. new pool. tokenfactory
• IBC support