INIT: ignite testnet Command

[julienrbrt]

Ignite testnet is an alternative to ignite chain serve (command that re-build and runs a single node chain).
That command should be used when in development (next to ignite chain simulate), but when willing to perform more realistic tests (with devnets/testnets) users should use the ignite testnet command:

ignite testnet:

• multi-node

  • INIT: Multi Node (Validator) Testnet #4374

• in-place

  • INIT: In-Place Testnet Creation #4244

• interchaintest

  • https://github.com/strangelove-ventures/interchaintest/tree/main/local-interchain
  • https://github.com/strangelove-ventures/interchaintest/blob/main/docs/buildBinary.md