Support fcm for user pins

[jibraniqbal666]

This support registering and sending fcm to core app, this only supports user pins.
Here is the mobile side of implementation coredevices/mobileapp#131

we need to update submodule of rws_common with

from setuptools import setup, find_packages

setup(
    name='rws-common',
    version='0.1',
    packages=find_packages(),
    platforms='any',
    install_requires=[
        'Flask',
        'honeycomb-beeline==2.11.4'
    ]
)

The update to python 3.9 is require due to firebase 7.2.0 have the functions such as 'send_each_for_multicast' which is required.

[hellcp]

We don't need this change, you should just drop it

[hellcp]

Also drop this

[hellcp]

This won't work, we need a config as env, not as a file, since the filesystem on the deployed workers always changes

[jibraniqbal666]

can you check how it can be achieve?
It can see that we can inject json as env as well, but I am only seeing this using a json file either for services.json or service-account.json

[hellcp]

There are a couple ways, some mentioned in https://firebase.google.com/docs/admin/setup#initialize_the_sdk