Add ABI L1B benchmarks

[mraspaud]

This PR adds benchmarks for the abi l1b reader

[codecov]

Codecov Report

Merging #1790 (d96f90c) into main (4c7c94b) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1790   +/-   ##
=======================================
  Coverage   92.90%   92.90%           
=======================================
  Files         265      265           
  Lines       38970    38970           
=======================================
  Hits        36205    36205           
  Misses       2765     2765           

Flag	Coverage Δ
behaviourtests	4.77% <ø> (ø)
unittests	93.44% <ø> (ø)

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[coveralls]

Coverage remained the same at 93.387% when pulling d96f90c on mraspaud:feature-abi-benchmarks into 4c7c94b on pytroll:main.

[djhoese]

Assuming these all still run then 👍

[mraspaud]

Just tried locally and it looks fine