Replace elastic by flow record

[janstarke]

Description

This change removes direct support for elasticsearch and enables mactime2 to write the record flow format, which is understood by rdump (which has elasticsearch support).

Example

cargo run --bin mactime2 -- -b tests/data/mactime2/csv_test.bodyfile -F record | rdump

Next steps

The next steps would be to enable all other timelining tools to directly write the record flow format, which is much more flexible, so that further processing can be done using rdump, elasticsearch, or others

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 57.74%. Comparing base (6a02f2f) to head (64eb685).
Report is 7 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main      #65       +/-   ##
===========================================
+ Coverage   34.21%   57.74%   +23.53%     
===========================================
  Files          36       14       -22     
  Lines        1140      568      -572     
===========================================
- Hits          390      328       -62     
+ Misses        750      240      -510     

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