feat: Add text editor

Use Monaco Editor to create notes. Support syntax highlighting. Store the
language with the note in the database to later support syntax highlighting in
a note web view.

Signed-off-by: Julien Riou <julien@riou.xyz>

src/cmd/collerd/README.md

@@ -31,6 +31,8 @@ The file format is **JSON**:
 * **prometheus_route** (string): Route to expose Prometheus metrics (default "/metrics")
 * **prometheus_notes_metric** (string): Name of the notes count metric (default "collerd_notes")
 * **observation_internal** (int): Number of seconds to wait between two observations (default 60)
+* **languages** ([]string): List of supported [languages](https://github.com/microsoft/monaco-editor/tree/main/src/basic-languages)
+* **language** (string): Default language (default "text")
 
 The configuration file is not required but the service might not be exposed to the public.
 
@@ -50,6 +52,7 @@ Body (JSON):
 * **encrypted** (bool): true if the content has been encrypted by the client
 * **expiration** (int): lifetime of the note in seconds (must be supported by the server)
 * **delete_after_read** (bool): delete the note after the first read
+* **language** (string): language of the note (must be supported by the server)
 
 Response (JSON):
 * **id** (string): ID of the note