feat: add nargo init command

[TomAFrench]

Description

Problem*

Resolves #1852

Summary*

This PR adds the nargo init command. Marking this as draft for the time being as I want to test some edge cases.

Documentation

• This PR requires documentation updates when merged.

  • I will submit a noir-lang/docs PR.
  • I will request for and support Dev Rel's help in documenting this PR.
    • Nargo will have a new nargo init command which will create a new project in the current directory.

Additional Context

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[phated]

Should we deprecate new?

[TomAFrench]

I don't think we need to deprecate new. We have both cargo new and cargo init living in parallel.

[jfecher]

Should we deprecate new?

new and init in cargo are for different usecases so we should have both to match cargo.

[kevaundray]

@TomAFrench whats the status of this PR?