Okta API tokens authenticate as "Authorization: SSWS <token>", a
scheme none of the existing API-key modes (Bearer, custom header,
Basic) can express. Add Registration.APIKeyAuthScheme, plumb it onto
APIKeyConnection.Scheme, and send it via a new schemeAuthTransport.
The three API-key presentations (BasicAuth, Header, Scheme) are
mutually exclusive; Register rejects setting more than one so a
misconfiguration fails at process start rather than silently.
Signed-off-by: Aurélien Sibiril <81782+aureliensibiril@users.noreply.github.com>
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