support jwt for live activity

[chanphiromsok]

LiveActivity Push using APNs

• when generating a token from pigeon I see that joken adds an extra header to jwt causing Apple reject jwt token when sending a push request
• I used an Authentication Token .p8 file to generate token base request with http2
• temporary solution I use jose
• my solution to generate jwt token for apns live activity https://gist.github.com/chanphiromsok/5f47832cc1b82c1e6c3e8736507fe4f4
• Apple does not allow headers to have type : "JWT"

  #accepted header
  headers = %{"alg" => "ES256", "kid" => @key_id}