GetContent doesn't support InputFileInfo

[BernieWhite]

Description of the issue

PSRule v0.20.0 introduced InputFileInfo for scanning repository file structure but it is not accepted by $PSRule.GetContent.

Expected behaviour

The GetContent method should support the InputFileInfo type since this is the most likely type to reference files from.

Module in use and version:

• Module: PSRule
• Version: 1.0.1

Captured output from $PSVersionTable:

Name                           Value
----                           -----
PSVersion                      7.1.1
PSEdition                      Core
GitCommitId                    7.1.1
OS                             Microsoft Windows 10.0.19042
Platform                       Win32NT
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0…}
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
WSManStackVersion              3.0