new: added basic json filter

[evilsocket]

Example:

PORTS => <file: filename="/Users/evilsocket/lab/legba/data/drip/ports.jsonl", toend="false">;

SCAN_PORTS_ON_NEW_SUBDOMAIN => @SUBDOMAINS | 
    json(selector="target") | 
    system(cmd="/Users/evilsocket/lab/legba/target/debug/legba tcp.ports --tcp-ports 80-10000 -T {{ .main }} --output /Users/evilsocket/lab/legba/data/drip/ports.jsonl --output-format jsonl");

[codecov[bot]]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (2fdb379) 50.90% compared to head (3e5cbfb) 51.75%.

Files	Patch %	Lines
filters/json.go	97.67%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master       #9      +/-   ##
==========================================
+ Coverage   50.90%   51.75%   +0.85%     
==========================================
  Files          41       42       +1     
  Lines        2322     2365      +43     
==========================================
+ Hits         1182     1224      +42     
- Misses       1040     1041       +1     
  Partials      100      100              

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