Search: Add filters for ISO number, focal length, and aperture range

[lastzero]

As a passionate photographer, I would love to find pictures by ISO, FNumber and Focal Length Range.

Usage Examples:

• iso:100-400
• f:2.8-3.5
• mm:28-35

Please note: Searching for a specific exposure/shutter speed value would also be possible, but since this is a text column, it is not trivial to perform a range scan. That is why I did not include it within the scope of this issue.

[lastzero]

An updated preview build for testing these changes will be available soon, see https://docs.photoprism.app/getting-started/updates/#development-preview.