feat: support `as-provided` generator option

[tbinna]

• update application generator to support as-provided option
• remove unnecessary @nx/workspace peer dependency from plugin package.json
• clean up init generator to only do things required to set up the plugin

Fixes #80

[github-actions[bot]]

:tada: This PR is included in version 3.2.0 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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