feat(users/Profpatsch/lyric): add vscode extension & helpers

* tap-bpm: simple CLI program that accepts key inputs and averages a
BPM value

* lyric-timing-mpv-script: If you press Ctrl+l, mpv attaches the
  current timestamp to a .lrc file named after the song.
  This is for manually timing missing songs for uploading them to
  https://lrclib.net/

* extension: vscode extension for `.lrc` files, currently with the
  following features:

    1. A “jump to LRC position” command which reads an .lrc timestamp
    from the current line and expects mpv to listen on
    `~/tmp/mpv-socket` (via `--input-ipc-server`), and will seek to
    the exact timestamp (down to the ms) in the currently playing
    song.

    2. Some initial linting warnings

      - A lint that warns if the difference to the next timestamp is
      more than 10s (which usually means there’s an instrumental and
      the previous line is stuck)

      - A lint that checks that timestamps are monotonically
      increasing

Change-Id: I32a4ac0e2c5bbe3d94e45ffcf647f81bc7c08aa0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/12537
Tested-by: BuildkiteCI
Reviewed-by: Profpatsch <mail@profpatsch.de>

users/Profpatsch/.vscode/launch.json

@@ -13,6 +13,32 @@
             "runtimeArgs": [
                 "run",
             ],
+        },
+        {
+            "type": "node",
+            "name": "Run tap-bpm",
+            "skipFiles": [
+                "<node_internals>/**"
+            ],
+            "request": "launch",
+            "program": "${workspaceFolder}/lyric/dist/index.js",
+            "preLaunchTask": "ninja build lyric",
+            "outFiles": [
+                "${workspaceFolder}/lyric/dist/**/*.js"
+            ],
+            "args": [
+                "tap-bpm"
+            ]
+        },
+        {
+            "preLaunchTask": "npm build lyric extension",
+            "name": "Launch lyric vscode Extension",
+            "type": "extensionHost",
+            "request": "launch",
+            "args": [
+                "--extensionDevelopmentPath=${workspaceFolder}/lyric/extension",
+                "${workspaceFolder}/lyric/extension"
+            ]
         }
     ]
 }