feat!: ComponentVersionMedia.key -> ComponentVersionMedia.path

BREAKING CHANGE: Renamed ComponentVersionMedia.key -> ComponentVersionMedia.path
BREAKING CHANGE: In create_component_version_media(...) and
                 look_up_component_version_media(...), renamed param key -> path.

Part of: #322

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: kdmccormick