refactor: First step of moving to internal functions: Minimum viable product

[Snuffy2]

Breaking change

This is the barely minimum viable product for the first PR. The bulk of this PR is the refactor of the data model. Please do not merge this into main/master. Maybe into a beta branch for those who'd like to help or test?

Rebuild of keymaster to utilize internal functions

• Coordinator redesigned to manage the status of all keymaster locks and the link to the physical locks
• Expand the KeymasterLock class to hold all of the necessary lock properties
• Standardize the code of entities using a KeymasterEntity base class
• Entities now get their value/state from the Coordinator
  • Converted existing Sensor and Binary Sensors
  • Added Text entities replacing input_text helper entities
• Create a device for each lock in keymaster with all of the keymaster entities for it
  • For child locks, set the via_device property to link the parent lock to the child lock

Current functionality in this PR

• Use existing keymaster setup (not sure it works for new setups yet)
• Check and show whether keymaster lock is connected to the physical lock
• Show code slot Name and PINs
• Update PINs and synchronize changes made in parent to child locks

To Do in future PRs

• Move input_boolean helper entities to switch entities
• Move input_number to number entities
• Move input_datetime to date, datetime or time entities
• Add boltchecked lock entity
• Add auto-lock timer entity
• Ensure new and change configurations work properly
• Store coordinator data to disk and restore on HA restart
• Figure out if there is anyway to migrate from the current version to this one or if it will require a remove/reinstall

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New feature (which adds functionality)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR is related to issue: [Feature Request] Move automations, scripts and helper entities to internal integration functions #393