feat: logging

[joske]

Using println! for logging is annoying when snarkVM is used as library (like snarkOS).

• Replace println and friends with logging
• install simple_logger impl in binaries where appropriate

[howardwu]

The aleo-cli usage must be println currently, as we pass this to the CLI. A larger refactor with the Leo team will be needed to change these functionalities.

[joske]

The log calls will use println! when used with the (now) provided SimplerLogger (see utilities/src/simpler_logger.rs).

In leo repository, there weren't many instances of println!, PR here: ProvableHQ/leo#2405

When snarkOS uses snarkVM, all these log calls will use the logger that snarkOS installs (instead of just indiscriminately printing to stdout).