Support for AWS China region

[linjungz]

Context

Zappa currently doesn't support AWS China region. We would like to use it for AWS China region, especially for Ningxia Region. You could kindly refer to this issue: #1564

Expected Behavior

Support for AWS China region.

Actual Behavior

Currently it doesn't support China region as arn format is different in AWS China region.

Possible Fix

1. Service availablity: Route53/ACM/Lambda EnvironmentVariablesFeature/Cloudfront are all available now in China region
2. As suggested in issue Some confuses in using zappa in aws china #1977 , need to fix core.py as partition in arn is "arn-cn" in China region.

Related issues:
#1338
#1977

Steps to Reproduce

Deploy zappa for China region

Your Environment

• Zappa version used: 0.51.0
• Operating System and Python version: MacOS, Python 3.8.5
• The output of pip freeze:
  acme==1.7.0
  appdirs==1.4.4
  argcomplete==1.12.0
  boto3==1.14.38
  botocore==1.17.38
  certbot==1.7.0
  certbot-s3front==0.4.2
  certifi==2020.6.20
  cffi==1.14.1
  cfn-flip==1.2.3
  chardet==3.0.4
  click==7.1.2
  ConfigArgParse==1.2.3
  configobj==5.0.6
  cryptography==3.0
  distlib==0.3.1
  distro==1.5.0
  docutils==0.15.2
  durationpy==0.5
  filelock==3.0.12
  future==0.18.2
  hjson==3.0.1
  idna==2.10
  Jinja2==2.11.2
  jmespath==0.10.0
  joblib==0.16.0
  josepy==1.3.0
  kappa==0.6.0
  livereload==2.6.2
  lunr==0.5.8
  Markdown==3.2.2
  MarkupSafe==1.1.1
  mkdocs==1.1.2
  mkdocs-material==5.5.3
  mkdocs-material-extensions==1.0
  mock==4.0.2
  nltk==3.5
  parsedatetime==2.6
  pip-tools==5.3.1
  placebo==0.9.0
  pycparser==2.20
  Pygments==2.6.1
  pymdown-extensions==7.1
  pyOpenSSL==19.1.0
  pyRFC3339==1.1
  python-dateutil==2.6.1
  python-slugify==4.0.1
  pytz==2020.1
  PyYAML==5.3.1
  regex==2020.7.14
  requests==2.24.0
  requests-toolbelt==0.9.1
  s3transfer==0.3.3
  six==1.15.0
  text-unidecode==1.3
  toml==0.10.1
  tornado==6.0.4
  tqdm==4.48.2
  troposphere==2.6.2
  urllib3==1.25.10
  virtualenv==20.0.30
  Werkzeug==0.16.1
  wsgi-request-logger==0.4.6
  zappa==0.51.0
  zope.component==4.6.2
  zope.deferredimport==4.3.1
  zope.deprecation==4.4.0
  zope.event==4.4
  zope.hookable==5.0.1
  zope.interface==5.1.0
  zope.proxy==4.3.5
• Your zappa_settings.json:
  {
  "dev": {
  "app_function": ".",
  "aws_region": "cn-north-1",
  "profile_name": "cnlab",
  "project_name": "zappa",
  "runtime": "python3.8",
  "s3_bucket": "zappa-a9i8ftiq0"
  }
  }

[linjungz]

Hi, could someone take a look at this issue? Thanks