Replace secretsdb with trufflehog

[TheTechromancer]

Trufflehog has become the defacto secrets module in BBOT. Since secretsdb tends to hog CPU by using old fashioned python regexes, it's high time it was replaced.

The key step here was modifying Trufflehog to accept HTTP_RESPONSE events. Trufflehog doesn't yet support stdin mode, so it currently uses the filesystem module. (see trufflesecurity/trufflehog#162).

FYSA @domwhewell-sage. What do you think of also including RAW_TEXT?

[domwhewell-sage]

Yeh I think we can include RAW_TEXT.

Looking at trufflehogs handlers it can search for secrets in .zip, .zip.gz, .tar.gz, .tgz, .tar, .rpm and .deb

So by giving it RAW_TEXT from .pdf's, word docs and alike we shouldn't be getting duplicated secrets

[codecov]

Codecov Report

Attention: Patch coverage is 98.85057% with 1 line in your changes missing coverage. Please review.

Project coverage is 93%. Comparing base (48c0859) to head (40d1aff).
Report is 25 commits behind head on dev.

Files with missing lines	Patch %	Lines
bbot/core/event/base.py	97%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff          @@
##             dev   #2092   +/-   ##
=====================================
- Coverage     93%     93%   -0%     
=====================================
  Files        376     374    -2     
  Lines      28689   28666   -23     
=====================================
- Hits       26491   26457   -34     
- Misses      2198    2209   +11     

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