Conditional tile feature

[JosephAbbey]

Proposed change

Added a conditional tile feature that uses the generic, pre-defined conditions code from the card and row.

This does not include a visual editor for the feature, as that is not yet implemented for the entity row either, and I am planning to implement it as a separate pr.

Type of change

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

Example configuration

type: tile
entity: update.demo_add_on
features:
  - type: conditional
    conditions:
      - condition: state
        entity: update.demo_add_on
        state_not: 'off'
    feature:
      type: update-actions
      backup: ask

Additional information

• This PR fixes or closes issue: fixes #
• This PR is related to issue or discussion:
• Link to documentation pull request:

Checklist

• The code change is tested and works locally.
• There is no commented out code in this PR.

If user exposed functionality or configuration variables are added/changed:

• Documentation added/updated for www.home-assistant.io