Switching to integrated bluetti library

[Patrick762]

Removed bluetti_mqtt dependency to prevent this integration from breaking because of aiomqtt deprecations.

If someone has ideas on how to improve this, feel free to open a PR to the "integrated-lib" branch.

[Patrick762]

Next steps:

• Copy over devices from bluetti_mqtt with field_attributes
• Create helpers to cleanup coordinator
• Create helper to identify devices by reading the device_type field
• Create one dummy device per protocol to test new devices (not in this PR)