simplify awxkit dependencies

- remove flake8 as an install requirements (it's only used for tests)
- vendor toposort, which is Apache 2.0 licensed (and very small)
- change websocket-client to a setuptools optional dependency, which you
  can install via:

  pip install "./awxkit[websockets]"

- add `jq` and `tabulate` under an additional optional setuptools
  dependency:

  pip install "./awxkit[formatting]"

- remove `cryptography`, which is only used for random RSA generation
  (unused by the CLI)

awxkit/awxkit/api/mixins/has_create.py

@@ -1,9 +1,8 @@
 from collections import defaultdict
 import inspect
 
-from toposort import toposort
-
 from awxkit.utils import get_class_if_instance, class_name_to_kw_arg, is_proper_subclass, super_dir_set
+from awxkit.utils.toposort import toposort
 
 
 # HasCreate dependency resolution and creation utilities

awxkit/awxkit/api/pages/credentials.py

@@ -1,10 +1,6 @@
 import logging
 
 
-from cryptography.hazmat.backends import default_backend
-from cryptography.hazmat.primitives import serialization
-from cryptography.hazmat.primitives.asymmetric import rsa
-
 from awxkit.utils import (
     cloud_types,
     filter_by_class,
@@ -47,6 +43,10 @@ credential_input_fields = (
 
 
 def generate_private_key():
+    from cryptography.hazmat.backends import default_backend
+    from cryptography.hazmat.primitives import serialization
+    from cryptography.hazmat.primitives.asymmetric import rsa
+
     key = rsa.generate_private_key(
         public_exponent=65537,
         key_size=4096,