Add item_lock_art, item_lock_poster item details

[axsuul]

Description

Support locking Plex art (background) and poster for all items within collection. Tested with this config which locks art and posters while also refreshing metadata for any movie released in the past 5 days.

collections:
  'Recent':
    build_collection: false
    item_lock_art: true
    item_lock_poster: true
    item_refresh: true
    plex_search:
      release: 5

Issues Fixed or Closed

None

Type of Change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas