Phash distance filter (#3596)

* Add phash_distance filter criterion
* Add distance to phash filter in UI

pkg/sqlite/phash.go

@@ -0,0 +1,10 @@
+package sqlite
+
+import "github.com/corona10/goimagehash"
+
+func phashDistanceFn(phash1 int64, phash2 int64) (int64, error) {
+	hash1 := goimagehash.NewImageHash(uint64(phash1), goimagehash.PHash)
+	hash2 := goimagehash.NewImageHash(uint64(phash2), goimagehash.PHash)
+	distance, _ := hash1.Distance(hash2)
+	return int64(distance), nil
+}