[PECOBLR-201] add variant support #2525

Job	Run time
check-linting (3.13)	26s
check-linting (3.11)	33s
check-linting (3.10)	33s
Unit Tests + PyArrow (Python 3.12, default deps)	1m 15s
check-linting (3.12)	30s
Unit Tests + PyArrow (Python 3.9, default deps)	56s
Unit Tests + PyArrow (Python 3.11, min deps)	1m 14s
Unit Tests + PyArrow (Python 3.10, default deps)	55s
Unit Tests (Python 3.13, default deps)	45s
Unit Tests + PyArrow (Python 3.10, min deps)	1m 22s
Unit Tests + PyArrow (Python 3.11, default deps)	54s
Unit Tests (Python 3.10, min deps)	1m 14s
check-types (3.12)	37s
Unit Tests + PyArrow (Python 3.9, min deps)	1m 15s
Unit Tests (Python 3.10, default deps)	32s
Unit Tests (Python 3.9, default deps)	34s
Unit Tests (Python 3.11, default deps)	26s
check-types (3.11)	35s
check-types (3.9)	49s
Unit Tests (Python 3.9, min deps)	58s
check-types (3.13)	26s
check-types (3.10)	33s
Unit Tests (Python 3.12, default deps)	34s
check-linting (3.9)	40s
Unit Tests (Python 3.11, min deps)	1m 0s
Unit Tests + PyArrow (Python 3.13, default deps)	1m 2s
	20m 38s

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