Event Context

[TheTechromancer]

The main feature of this PR is a new attribute on every event: discovery_context. This contains a human-friendly description of exactly how the data was discovered, including any nuanced circumstances around its creation.

For convenience, a discovery_path attribute has been added (to JSON and CSV outputs) that contains the full discovery chain from the scan target all the way to the current event.

Also, the event .source attribute has been renamed to .parent for clarity.

TODO:

• [x] speculate
• [x] excavate
• [x] DNS resolution
• [x] code-enum family (especially postman)
• [x] dehashed
• [x] massdns
• [x] bucket modules

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.45455% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 92%. Comparing base (1691332) to head (325d2ed). Report is 27 commits behind head on bbot-2.0.

:exclamation: Current head 325d2ed differs from pull request most recent head 79c59ed

Please upload reports for the commit 79c59ed to get more accurate results.

Files	Patch %	Lines
bbot/modules/portscan.py	42%	7 Missing :warning:
bbot/modules/internal/excavate.py	74%	4 Missing :warning:
bbot/core/event/base.py	97%	3 Missing :warning:
bbot/modules/output/asset_inventory.py	50%	3 Missing :warning:
bbot/modules/deadly/nuclei.py	50%	2 Missing :warning:
bbot/modules/dnsbrute_mutations.py	85%	2 Missing :warning:
bbot/modules/fingerprintx.py	82%	2 Missing :warning:
bbot/modules/skymem.py	89%	2 Missing :warning:
bbot/modules/sslcert.py	67%	2 Missing :warning:
bbot/modules/templates/bucket.py	72%	2 Missing :warning:
... and 5 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## bbot-2.0 #1383 +/- ## ========================================= - Coverage 92% 92% -0% ========================================= Files 340 340 Lines 23048 23295 +247 ========================================= + Hits 21150 21370 +220 - Misses 1898 1925 +27 ```

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