Add config parameter for value task consumption

[CoolCoderSuper]

This adds a config option to CA2012 (ValueTask consumption).
The analyzer allows consumption via ConfigureAwait and a few others however it maybe useful to allow other methods as well.
For example:

    <Extension>
    Public Function KeepContext(a As ValueTask) As ConfiguredValueTaskAwaitable
        Return a.ConfigureAwait(True)
    End Function

    <Extension>
    Public Function FreeContext(a As ValueTask) As ConfiguredValueTaskAwaitable
        Return a.ConfigureAwait(False)
    End Function

Using these methods would trigger the warning.

dotnet_code_quality.additional_valid_valuetask_consumption=KeepContext|FreeContext

Or can configured like so.

Sorry if I did something incorrectly.

Fixes #7461