Add getPhonenumber rpc for PhoneSnippet
Test: Locally using snippet_shell.py
    ad (android_device.AndroidDevice)
    snippet or s (Snippet)
>>> s.getPhoneNumber()
'getting the number here'

Bug: 302013776

Change-Id: I97c5c5a56cb208aa5532595ed845eb717fc03e5a
3 files changed