add `kafka` and `pcap` feature

[codecov[bot]]

Codecov Report

Merging #49 (581e2e9) into main (0e11595) will decrease coverage by 19.17%. The diff coverage is n/a.

:exclamation: Current head 581e2e9 differs from pull request most recent head 89a51b3. Consider uploading reports for the commit 89a51b3 to get more accurate results

@@             Coverage Diff             @@
##             main      #49       +/-   ##
===========================================
- Coverage   54.40%   35.22%   -19.18%     
===========================================
  Files           7        7               
  Lines         375      599      +224     
===========================================
+ Hits          204      211        +7     
- Misses        171      388      +217     

Impacted Files	Coverage Δ
src/lib.rs	22.46% <ø> (+13.37%)	:arrow_up:
src/pcap.rs	0.00% <0.00%> (-76.82%)	:arrow_down:
src/kafka.rs	0.00% <0.00%> (ø)

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