debugger: Add comment-preserving debug.json editing (#32896)

Release Notes:

- Re-added "Save to `debug.json`" for custom debug tasks

---------

Co-authored-by: Cole Miller <cole@zed.dev>

Cargo.lock

@@ -4293,6 +4293,7 @@ dependencies = [
  "rpc",
  "serde",
  "serde_json",
+ "serde_json_lenient",
  "settings",
  "shlex",
  "sysinfo",
@@ -4300,6 +4301,8 @@ dependencies = [
  "tasks_ui",
  "terminal_view",
  "theme",
+ "tree-sitter",
+ "tree-sitter-json",
  "ui",
  "unindent",
  "util",