Implement proper WhatIf/Confirm support

[Smalls1652]

Problem

Right now cmdlets that initiate potentially dangerous actions do not have any sort of -WhatIf or -Confirm support. This can be a problem for use-cases where a dry-run would be wanted.

Suggested Actions

Add SupportsShouldProcess and ConfirmImpact, if applicable, to the cmdlets. Then apply the ShouldProcess() method around the SendApiCall() method.

For example:

if (ShouldProcess("{target}", "{action}"))
{
string apiJson = SendApiCall(apiUri, apiPost, HttpMethod.Post);
T apiResult = new JsonConverter<T>(apiJson).Value;
WriteObject(apiResult);
}