Improve clarinet requirement handling

[hugocaillard]

Context

Clarinet requires developers to manually add requirements with:

clarinet requirements add <contract principal>

Clarinet will fetch the contract on mainnet on testnet, detect all of requirements dependencies (other contract fetched by the requirements)

Caveats

• Developers can often forget to do so
  • It's even more easy to forgot to remove a dependency that was wrongly added (or not needed anymore
• In the context of remote data fetching (Mainnet Execution Simulation #1503), it's possible that a contract is in the requirements (making clarinet check valid), but was actually deployed at a higher height than the once specified in the remote data settings

Ideas

• Clarinet could aumatically detect local contract dependencies and load them, without the need to manually add or list requirements in the manifest. We could fully remove the concept of "dependencies"
• If remote_data is enabled, clarinet should check that the mainnet/testnet dependencies are valid (available on the right network and deployed at a height lower than the one specified in the remote data settings)