[Feature Request]: allow passing Livekit token via query parameters

[grrtrr]

The use of the Authorization header in the SDK rules out using third-party authorization with LiveKit.

Problem Description

The current way of attaching a LiveKit token is via an Authorization header.
There is only one such header, multiple Authorization headers are not supported.

The LiveKit server is flexible in accepting an AccessToken:

1. via the Authorization header, and
2. via URL query parameters.

The problem is: when the LiveKit server is hosted on premises, third party authorization is required to secure the deployment (TLS termination).
In many cases, this, too, will use an Authorization header.

With the server SDK, this scenario is currently not possible.

What to Do

Make the use of the authentication token configurable to support:

1. passing the LiveKit token via Authorization header (as currently done, perhaps as fallback); or alternatively
2. passing the LiveKit token via URL query parameters.