Added some missing switches to apply, init, and plan settings

[tannerwatson]

Description

• Added the -input switch to init, plan, apply settings
• Added the -backend switches to init settings

Related Issue

#55

Motivation and Context

Adds missing switches

How Has This Been Tested?

Wrote unit tests of course, then referenced the dll directly in one of my ADO builds that performs init with the backend disabled for template validation. The build packaged the cake scripts, along with the referenced dll, as an artifact that was then used to deploy to my development environment. During the deployment the init, plan, and apply tasks are executed. The behavior of the build and deployment was identical to manually adding the settings via ArgumentCustomization = args =>

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[nils-a]

LGTM!

[nils-a]

@tannerwatson your changes have been merged, thanks for your contribution 👍