Handle -help usage in stacks plugin

[Maed223]

Description

This PR provide the raw args to the StacksCommand's Help() which allows for the more typical -help usage rather than strictly requiring the -usage flag for command usage information.

We previously ran into trouble with the handling of the -help flag in regards to the the stacks CLI plugin. Notably since the cli runner strips the -help flag from the args passed to the command's Run implementation. At the time we encountered this we opted for a stop gap solution of using the -usage flag for help texts. This PR at adds the ability to properly handle the help flag.

Target Release

1.14.x

Rollback Plan

• If a change needs to be reverted, we will roll out an update to the code within 7 days.

Changes to Security Controls

Are there any changes to security controls (access controls, encryption, logging) in this pull request? If so, explain.

CHANGELOG entry

• This change is user-facing and I added a changelog entry.
• This change is not user-facing.

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