Update utils.py to forward size parameter in RawPcapnpReader

[StempunkDev]

I found this little flaw when reading packages from a pcap that was captured on a different device. This fixed the issue of raw data being truncated. If there is a good reason to ignore the size in here lmk

Checklist:

• I executed the regression tests (using cd test && ./run_tests or tox)

RawPcapNgReader will now forward size to lower level parsing, allowing for configuration to trickle down
Default state is not touched.
Unit tests should ideally not be effected by this

There should be no impact in other parts of the library

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.56%. Comparing base (d947ff1) to head (63794fd).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4721      +/-   ##
==========================================
- Coverage   82.12%   78.56%   -3.56%     
==========================================
  Files         361      336      -25     
  Lines       87079    81872    -5207     
==========================================
- Hits        71510    64323    -7187     
- Misses      15569    17549    +1980     

see 288 files with indirect coverage changes

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