Add `-SkipLimitCheck` switch to `Import-PowerShellDataFile`

[sdwheeler]

Summary of the new document or enhancement

• List of articles that need to be updated: https://github.com/MicrosoftDocs/PowerShell-Docs/blob/staging/reference/7.2/Microsoft.PowerShell.Utility/Import-PowerShellDataFile.md
• New articles that need to be created:
• Link(s) to related code PR(s) in the PowerShell/PowerShell repo: Add -SkipLimitCheck switch to Import-PowerShellDataFile PowerShell/PowerShell#13672
• Link(s) to related issue(s) in the PowerShell/PowerShell repo: Import-PowerShellDataFile Errors on files over 3230 lines PowerShell/PowerShell#7979

Description of what changed

By default, there is a limit to the number of keys in a hashtable allowed to be converted from a psd1 file (500 keys). This limit is hitting user cases like DSC configuration. Change is to add a -SkipLimitCheck switch to by-pass the validation step for a hashtable.