Add basic benchmarks

[Schamper]

Closes #128. More should be added but at least it's a start.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 0.00%. Comparing base (194b1b5) to head (32e61e9).

❗ There is a different number of reports uploaded between BASE (194b1b5) and HEAD (32e61e9). Click for more details.

HEAD has 12 uploads less than BASE

Flag	BASE (194b1b5)	HEAD (32e61e9)
unittests	26	14

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #141       +/-   ##
==========================================
- Coverage   93.01%   0.00%   -93.02%     
==========================================
  Files          21      21               
  Lines        2435    2435               
==========================================
- Hits         2265       0     -2265     
- Misses        170    2435     +2265     

Flag	Coverage Δ
unittests	0.00% <ø> (-93.02%)	⬇️

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[codspeed-hq]

Congrats! CodSpeed is installed 🎉

🆕 5 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• test_benchmark_union[compiled]: 128.1 µs
• test_benchmark_basic[compiled]: 82.4 µs
• test_benchmark_basic[interpreted]: 103.4 µs
• test_benchmark_union[interpreted]: 122.7 µs
• test_benchmark_attribute_access: 15.5 µs

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