[PECOBLR-201] add variant support #2524

Job	Run time
check-linting (3.11)	37s
check-linting (3.10)	33s
Unit Tests (Python 3.9, default deps)	43s
check-linting (3.12)	40s
check-linting (3.13)	36s
Unit Tests (Python 3.10, default deps)	49s
Unit Tests (Python 3.9, min deps)	57s
check-linting (3.9)	40s
check-types (3.9)	38s
Unit Tests (Python 3.12, default deps)	40s
check-types (3.11)	53s
Unit Tests (Python 3.13, default deps)	38s
Unit Tests (Python 3.11, default deps)	45s
check-types (3.13)	1m 0s
check-types (3.10)	33s
Unit Tests (Python 3.10, min deps)	1m 11s
check-types (3.12)	43s
Unit Tests + PyArrow (Python 3.10, default deps)	1m 5s
Unit Tests (Python 3.11, min deps)	1m 8s
Unit Tests + PyArrow (Python 3.9, min deps)	1m 20s
Unit Tests + PyArrow (Python 3.12, default deps)	1m 0s
Unit Tests + PyArrow (Python 3.11, min deps)	1m 24s
Unit Tests + PyArrow (Python 3.9, default deps)	59s
Unit Tests + PyArrow (Python 3.10, min deps)	1m 12s
Unit Tests + PyArrow (Python 3.11, default deps)	1m 2s
Unit Tests + PyArrow (Python 3.13, default deps)	1m 1s
	22m 47s

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