Implement snapshot window support in New-RubrikSLA

[pfguglielmi]

Is your feature request related to a problem? Please describe.

Currently, only frequency and retention can be set in an SLA Domain with PowerShell. It's not possible to set a snapshot windows for the first full and subsequent incrementals when creating a new SLA Domain with PowerShell.

Describe the solution you'd like

Add parameters to New-RubrikSLA to support snapshot window settings.

Describe alternatives you've considered

A clear and concise description of any alternative solutions or features you've considered.

Additional context

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