MCP OAuth to support "device_code" Grant Type

[evalstate]

I would like VSCode to support the device_code grant-type for when OAuth fails, or if it is the only provided option.

At the moment this configuration:

[0]   grant_types: [ 'urn:ietf:params:oauth:grant-type:device_code' ],

Still attempts to open the browser:

@coyotte508