Add support for more CLI options

[chitralverma]

Hi, It'll be awesome to add some of the standard options in line with cargo fmt like.

  -q, --quiet
          No output printed to stdout
  -v, --verbose
          Use verbose output
  -m, --manifest-path <manifest-path>
          Specify path to Cargo.toml

[thomaseizinger]

-m, --manifest-path
Specify path to Cargo.toml

This is basically already supported via cwd. I am not sure --manifest-path itself makes a lot of sense because the point of this CLI is to format the Cargo.toml file itself whereas with cargo fmt, you want to discover the workspace and format the corresponding Rust files.

Happy to review a PR for the other two!