Fix problems that prevent mypy from running cleanly

**Is your feature request related to a problem? Please describe.**
Running mypy on the project results in 168 errors at the time of this writing. A significant portion of these errors are due to missing stubs for the following packages:

- boto3
- botocore
- bson
- Gevent
- gridfs
- flask_pymongo
- flask_restful
- impacket
- ldaptor
- marshmallow_enum
- Mongoengine
- netifaces
- nmb
- ntsecuritycon
- odict
- psutil
- pubsub
- pyAesCrypt
- Pyinstaller
- pymongo
- pymssql
- pypykatz
- pysub
- ring
- win32api
- win32con
- win32event
- win32file
- win32job
- win32process
- win32security
- winsys

```shell
monkey/monkey$ mypy --exclude tests/ common/ infection_monkey/ monkey_island --explicit-package-bases --namespace-packages
monkey_island/setup/gevent_setup.py:1: error: Skipping analyzing "gevent": module is installed, but missing library stubs or py.typed marker
monkey_island/docs/source/conf.py:213: error: Need type annotation for "latex_elements" (hint: "latex_elements: Dict[, ] = ...")
monkey_island/cc/database.py:1: error: Skipping analyzing "gridfs": module is installed, but missing library stubs or py.typed marker
...
Found 168 errors in 103 files (checked 568 source files)
```

**Describe the solution you'd like**
Fix the errors so that mypy runs cleanly.