Create initial APIs for ChromeAndroidTaskFeature

Changes:
(1) Add ChromeAndroidTaskFeature APIs to support syncing its lifecycle
    with ChromeAndroidTask:
    ```
    onAddedToTask();
    onTaskRemoved();
    ```

(2) Call those APIs in `ChromeAndroidTaskImpl`.

(3) Add Robolectric tests.

Bug: 431289118
Change-Id: Ic480b19403d390a1ee7b0c5d585ee591a2ad7071
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6758154
Reviewed-by: Tommy Nyquist <nyquist@chromium.org>
Commit-Queue: Linyu He <linyuh@google.com>
Cr-Commit-Position: refs/heads/main@{#1491135}