epic: stargate migration and dependency cleanup

[Unique-Divine]

• (nibiru-std): impl From<cosmwasm_std::Coin> for cosmos::base::v1beta1::Coin
• refactor(bindings-migration): rm bindings-perp and dummy
• fix(stargate-migration): make workspace deps consistent across contracts + core prefix
• refactor(stargate-migration): make macro a workspace dependency
• refactor: rm external artifacts as they were only there as examples
• refactor(scripts): Simplify wasm-out.sh
• feat(justfile): add cosmwasm-check just command
• feat(packages): run tidy and extract bash-rs to its own package
• feat(contracts): add cw3-flx-msig as core contract with stargate feature
• refactor: workspace deps + token vesting should be core
• docs(contracts): Describe each contract in the README
• docs(contracts): Describe each contract in the README
• build(artifacts): fresh wasm and checksums
• feat(nibiru-std): update to workspace deps + impl traits for cosmos bank
• feat(scripts): add wasm_out.rs Rust script for extensibility
• chore(deps): use workspace deps in scripts