When parsing a PowerShell function, we need a way to specify a session context with modules which are only available to the function app

Need to be able to specify a context when using Parser.ParseFile (to specify modules available only to the function app).

Currently, when parsing PowerShell files, there is not way to pass a session context. Instead, PowerShell uses a global context. This means that we do no have a way to only specify modules which are only available to the function app. As a workaround right now, we need to install the modules in one of the global paths of `$Env:PSModulePath`.

Our parsing code is located at:

https://github.com/Azure/azure-functions-powershell-library/blob/0577102f7cb97a606637078f2a0be491f469b247/src/WorkerIndexingHelper.cs#L76

This is the PowerShell API that we use the parse the files: https://learn.microsoft.com/en-us/dotnet/api/system.management.automation.language.parser.parsefile?view=powershellsdk-7.3.0