Refactoring and indefinite reconnect (v1.0.0)

[mjmeli]

Somewhat larger realtime factoring plus improvements to support more graceful error handling and indefinite reconnecting

A highlight of realtime client changes include

• Breaking Update external interface by renaming callback functions to be fully named (e.g. on_msg -> on_message). This is a breaking change and the main reason for a major version update.
• Create a new MqttError class that will wrap MQTT related exceptions, and make sure these exceptions are thrown in failure instances as opposed to suppressing them
• Update connect_and_subscribe to be callable multiple times
• Implement connect_and_subscribe_forever as a wrapper around connect_and_subscribe which will attempt to auto-recover from any disconnections with an exponential back-off strategy
• Add new connected future which will trigger when on_connect is called. This allows us to do a timeout wait and detect when connection is never achieved.
• Add more type hints to help with type safety
• Miscellaneous linting fixes

Plus some changes to development

• Run build and tests on pushes to all branches, not just main
• Update tox file to handle deprecation errors