feat(api): added filters on genre & md5 for files api (#3127)

### Description
Added filters for genre and md5 to the files API, e.g.
`/api/v2/files?genre=soul`

**This is a new feature**: Yes

**I have updated the documentation to reflect these changes**: No
There should be a schema and docs that are generated automatically. I
don't know where that is.

### Testing Notes

**What I did:**
- Used docker to deploy locally
- Confirmed filters work at
http://localhost:8080/api/v2/files?genre=Soul

**How you can replicate my testing:**
- `make clean dev`
- Upload some files!
- Visit http://localhost:8080/api/v2/files
- You can use the filters
<img width="658" alt="Screenshot 2024-12-23 at 01 36 01"
src="https://github.com/user-attachments/assets/ba19f7f3-fb3e-495d-8937-d451c70d326c"
/>
<img width="652" alt="Screenshot 2024-12-23 at 01 35 56"
src="https://github.com/user-attachments/assets/c7191131-a963-463a-b52f-9d0952192555"
/>

_How can the reviewer validate this PR?_
- See above
- wrote tests to confirm filters work
libretime/libretime@b1bdd6d

Author: libretime-bot

schema.yml

@@ -154,6 +154,15 @@ paths:
   /api/v2/files:
     get:
       operationId: files_list
+      parameters:
+        - in: query
+          name: genre
+          schema:
+            type: string
+        - in: query
+          name: md5
+          schema:
+            type: string
       tags:
         - files
       security: