Bundz: create bundz translation service with mock translator

A bundz translation service is created under //chrome/services to
provide translation for the blink API or maybe other components like
speech.

In this CL, only the mock translator is implemented. It can only
"translate" the text to the same language by echoing the input.

The service should be launched in the utility process and the other
component would communicate with it via mojo to check if translation
between a pair of language is supported, and create translator.

Bug: 331733060

Change-Id: Ic4c6ce79daf845741e110868249299f9b8fc2eff
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5382015


Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Takashi Toyoshima <toyoshim@chromium.org>
Commit-Queue: Mingyu Lei <leimy@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1283903}