pw_tokenizer: Add prefix to AutoUpdatingDetokenizer

Allow AutoUpdatingDetokenizer to set the prefix in base
Detokenizer class

Change-Id: I34a4981037fe34f44d8a524b3d04647bd47e426f
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/243612
Presubmit-Verified: CQ Bot Account <[email protected]>
Commit-Queue: Auto-Submit <[email protected]>
Lint: Lint 🤖 <[email protected]>
Reviewed-by: Wyatt Hepler <[email protected]>
Docs-Not-Needed: Wyatt Hepler <[email protected]>
Pigweed-Auto-Submit: Al Semjonovs <[email protected]>

pw_tokenizer/py/pw_tokenizer/detokenize.py

@@ -524,14 +524,15 @@ def __init__(
         *paths_or_files: Path | str,
         min_poll_period_s: float = 1.0,
         pool: Executor = ThreadPoolExecutor(max_workers=1),
+        prefix: str | bytes = encode.NESTED_TOKEN_PREFIX,
     ) -> None:
         self.paths = tuple(self._DatabasePath(path) for path in paths_or_files)
         self.min_poll_period_s = min_poll_period_s
         self._last_checked_time: float = time.time()
         # Thread pool to use for loading the databases. Limit to a single
         # worker since this is low volume and not time critical.
         self._pool = pool
-        super().__init__(*(path.load() for path in self.paths))
+        super().__init__(*(path.load() for path in self.paths), prefix=prefix)
 
     def __del__(self) -> None:
         self._pool.shutdown(wait=False)