VirusTotal Resolver Support

[chapinb]

Initial support for resolving IP address information using VirusTotal.

Tasks:

• Add documentation for VirusTotal module usage
• Address 204 rate limiting responses
• Add use cases for VirusTotal, showing example config files, CLI arguments, and output
• Increase unit test coverage

[sourcery-ai]

Sourcery Code Quality Report (beta)

❌  Merging this PR will decrease code quality in the affected files by 0.22 out of 10.

Quality metrics	Before	After	Change
Complexity	2.20	2.17	-0.03 🔵
Method Length	63.53	77.94	14.41 🔴
Quality	8.34	8.12	-0.22 🔴

Other metrics	Before	After	Change
Lines	1876	1721	-155

Changed files	Quality Before	Quality After	Quality Change
doc_src/source/conf.py	9.14	9.14	0.00
libchickadee/init.py	9.58	9.58	0.00
libchickadee/chickadee.py	7.48	7.45	-0.03 🔴
libchickadee/resolvers/virustotal.py		7.71
libchickadee/test/test_chickadee.py	8.53	8.49	-0.04 🔴
libchickadee/test/test_resolver_virustotal.py		8.62

Here are some functions in these files that still need a tune-up:

File	Function	Complexity	Length	Overall	Recommendation
libchickadee/resolvers/virustotal.py	ProResolver.parse_vt_resp	6	439.26	4.53	Split out functionality
libchickadee/chickadee.py	entry	8	237.70	5.06	Split out functionality
libchickadee/test/test_chickadee.py	ChickadeeFileTestCase.setUp	0	235.38	5.87	Split out functionality
libchickadee/chickadee.py	arg_handling	0	219.28	6.00	Split out functionality
libchickadee/test/test_chickadee.py	ChickadeeFileTestCase.test_ipapi_resolve_query_folder	0	157.98	6.71	Split out functionality

Please see our documentation here for details on how these metrics are calculated.

We are actively working on this report - lots more documentation and extra metrics to come!

Let us know what you think of it via email or our Gitter!