feat(users/Profpatsch/lyric/ext): add bpm quantization

It’s a bit crappy and really depends on the input field opening
quickly again (which it often doesn’t really do…), but it was the
easiest way I figured how to do it haha.

Aligning to eigth notes is pretty much the easiest way to sync
everything up after tapping in the timestamps (for most songs).

Change-Id: Ibbb072f62b6ee17d983e81b6c1554bc3516fa636
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12551
Reviewed-by: Profpatsch <mail@profpatsch.de>
Tested-by: BuildkiteCI

users/Profpatsch/lyric/extension/package.json

@@ -29,6 +29,11 @@
         "command": "extension.shiftLyricsUp",
         "title": "Shift Lyrics Up from Current Line",
         "category": "LRC"
+      },
+      {
+        "command": "extension.quantizeToEigthNote",
+        "title": "Quantize timestamps to nearest eighth note",
+        "category": "LRC"
       }
     ],
     "languages": [