Fix backwards compatability with output objects

[alerickson]

PR Summary

Output objects were missing properties that v2 scripts can depend on. For example, Get-PSRepository returned v3's Uri/Priority/ApiVersion shape instead of v2's SourceLocation/InstallationPolicy/PackageManagementProvider shape, breaking scripts that check $repo.InstallationPolicy.Output objects were returning PSResourceGet objects instead of PowerShellGet v2 objects. Another example is relayed in the issue #39.

Scripts written for PowerShellGet v2.2.5 and below can expect specific properties on output objects:

• Get-PSRepository: SourceLocation, InstallationPolicy, Registered, PackageManagementProvider, PublishLocation, ScriptSourceLocation, ScriptPublishLocation, ProviderOptions

• Find-Module, Get-InstalledModule, etc.: RepositorySourceLocation, PackageManagementProvider

The compat module was only translating input parameters — it was passing through v3 output objects unchanged, which have different property names, different property sets, and different display formatting.

Changes made:

• Added Add-V2RepositoryProperties helper — converts PSResourceRepository objects into PSCustomObjects with the full v2 property set (Name, SourceLocation, Trusted, Registered, InstallationPolicy, PackageManagementProvider, PublishLocation, ScriptSourceLocation, ScriptPublishLocation, ProviderOptions)
• Added Add-V2ResourceProperties helper — converts PSResourceInfo objects into PSCustomObjects with v2 property order (Name, Version, Type, Description, ... RepositorySourceLocation, Repository, PackageManagementProvider, AdditionalMetadata, InstalledLocation)
• Piped output through the appropriate helper in all 17 cmdlets that can return objects
  Added Update-TypeData for both output types to set default table display columns matching v2
• Added test coverage Get-PSRepository, Register-PSRepository, Find-Module, Find-Script, Find-Command, Find-DscResource, Get-InstalledModule, Get-InstalledScript, plus 2 skipped integration tests for Install-Module/Update-Module with -PassThru

Before:

After:

PR Context

Resolves issue #39