Add new -AsJWT switch for Bearer/API key authentications

[Badgerati]

Add a new -AsJWT switch to New-PodeAuthScheme for Bearer and API key authentications.

This will work in a similar fashion to the new -AsCredential, where if -AsJWT is supplied, then Pode will attempt to parse the token/key as a JWT, and then pass that object to Add-PodeAuth instead of the token/key:

Bearer:

New-PodeAuthScheme -Bearer -AsJWT | Add-PodeAuth -Name 'Example' -ScriptBlock {
    param($jwt)
}

ApiKey:

New-PodeAuthScheme -ApiKey -AsJWT | Add-PodeAuth -Name 'Example' -ScriptBlock {
    param($jwt)
}

If the token/key fails to parse as a valid JWT, a 400 should be returned.