v0.12.2

Removed:

• Removed automatic ESP-IDF logging - this will be reintroduced in a future
  release with more configuration options.

Added:

• Improved "client not running" error logs with additional context

Fixed:

• Zephyr: Fix crash when repeatedly stopping and starting the client
• Zephyr: Fix up to 10 second delay when stopping client
• Zephyr: Fixed hang when attempting to stop an already stopped client
• Fixed dropped function call when assert() is disabled
• Return error instead of crashing on NULL input