First draft of explanation_performance guide #2934

Job	Run time
GHA Security Analysis using Zizmor	13s
should run ci	7s
cache-pixi-lock	49s
TypeChecking: pixi run typing	1m 42s
build-and-upload-nightly-parcels	1m 52s
Flaky unit tests: ubuntu \| pixi run -e test tests-flaky	3m 2s
Unit tests: ubuntu \| pixi run -e test-py313 tests	2m 14s
Validation tests \| pixi run tests-validation	2m 3s
Unit tests: ubuntu \| pixi run -e test-minimum tests	5m 46s
Unit tests: ubuntu \| pixi run -e test tests	4m 25s
Unit tests: ubuntu \| pixi run -e test-py311 tests	5m 47s
Unit tests: windows \| pixi run -e test tests	12m 2s
Integration: ${{ matrix.os }} \| pixi run -e ${{ matrix.pixi-environment }} tests-notebooks	0s
merge-test-artifacts	0s
	40m 2s

Provide feedback