Add WebSocket bindings (#419)

`awscrt.websocket` contains bindings for aws-c-http's [websocket.h](https://github.com/awslabs/aws-c-http/blob/v0.6.28/include/aws/http/websocket.h)

This code has already been reviewed in 3 incremental pull-requests:
- #411
- #414
- #416

.builder/actions/aws_crt_python.py

@@ -14,29 +14,6 @@
 PYTHON_DEFAULT = '{python}'
 
 
-class InstallPythonReqs(Builder.Action):
-    def __init__(self, trust_hosts=False, deps=[], python=PYTHON_DEFAULT):
-        self.trust_hosts = trust_hosts
-        self.core = ('pip', 'setuptools', 'wheel')
-        self.deps = deps
-        self.python = python
-
-    def run(self, env):
-        trusted_hosts = []
-        # These are necessary for older hosts with out of date certs or pip
-        if self.trust_hosts:
-            trusted_hosts = ['--trusted-host', 'pypi.org', '--trusted-host', 'files.pythonhosted.org']
-
-        # setuptools must be installed before packages that need it, or else it won't be in the
-        # package database in time for the subsequent install and pip fails
-        steps = []
-        for deps in (self.core, self.deps):
-            if deps:
-                steps.append([self.python, '-m', 'pip', 'install', '--upgrade', *trusted_hosts, *deps])
-
-        return Builder.Script(steps, name='install-python-reqs')
-
-
 class SetupForTests(Builder.Action):
 
     def run(self, env):
@@ -247,7 +224,7 @@ def run(self, env):
         python = args.python if args.python else PYTHON_DEFAULT
 
         actions = [
-            InstallPythonReqs(deps=[], python=python),
+            [python, '-m', 'pip', 'install', '--upgrade', '--requirement', 'requirements-dev.txt'],
             SetupForTests(),
             [python, '-m', 'pip', 'install', '--verbose', '.'],
             # "--failfast" because, given how our leak-detection in tests currently works,

.github/workflows/ci.yml

@@ -139,6 +139,7 @@ jobs:
           AWS_SECRET_ACCESS_KEY:
           AWS_DEFAULT_REGION:
         run: |
+          python3 -m pip install --upgrade --requirement requirements-dev.txt
           python3 -m pip install . --verbose
           python3 -m unittest discover --failfast --verbose
 
@@ -166,7 +167,7 @@ jobs:
         run: |
           python3 -m pip install sphinx
           python3 -m pip install --verbose .
-          ./scripts/make-docs.sh
+          ./scripts/make-docs.py
 
   check-submodules:
     runs-on: ubuntu-20.04 # latest

.github/workflows/docs.yml

@@ -22,7 +22,7 @@ jobs:
         run: |
           python3 -m pip install sphinx
           python3 -m pip install --verbose .
-          ./scripts/make-docs.sh
+          ./scripts/make-docs.py
 
       - name: Commit
         run: |

awscrt/__init__.py

@@ -9,7 +9,8 @@
     'http',
     'io',
     'mqtt',
-    's3'
+    's3',
+    'websocket',
 ]
 
 __version__ = '1.0.0.dev0'