Implement heartbeat check-ins #198

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3 errors and 10 warnings

test impl Jason.Encoder encodes a cron check-in event (Appsignal.CheckInEventTest)

test impl Jason.Encoder encodes a heartbeat check-in event (Appsignal.CheckInEventTest)

Process completed with exit code 1.

function upgrade/3 required by behaviour Plug.Conn.Adapter is not implemented (in module Plug.Adapters.Cowboy.Conn)

Supervisor.Spec.worker/3 is deprecated. Use the new child specifications outlined in the Supervisor module instead

Plug.Adapters.Cowboy.http/3 is deprecated. Use Plug.Cowboy.http/3 instead

Plug.Adapters.Cowboy.shutdown/1 is deprecated. Use Plug.Cowboy.shutdown/1 instead

variable "opts" is unused (if the variable is not meant to be used, prefix it with an underscore)

Logger.Formatter.new/1 is undefined or private

Map.reject/2 is undefined or private

:simple_one_for_one strategy is deprecated, please use DynamicSupervisor instead

appsignal: Deprecation warning: The `skip_session_data` config option is deprecated. Please use `send_session_data` instead.