Add capability to import PSProfile compatible settings from an ExternalScript

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Proposed command

Import-ScriptToPSProfile

Goal

Parse an ExternalScript file using the AST and import any PSProfile compatible settings to the configuration. Initial scope:

• PSReadline settings (to go along with Add support for managing PSReadline settings from PSProfile #10)
• Variables
• Command Aliases
• Imported modules
• Prompts

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Digging a bit more into this