refactor: hide data source configuration behind dataSystem interface #208

Job	Run time
go-versions / go-versions	4s
Windows, Go 1.23	1m 19s
Windows, Go 1.22	2m 8s
Windows, Go 1.18	1m 0s
Linux, Go 1.18 / Benchmarks	3m 55s
Linux, Go 1.18 / Contract Tests	25s
Linux, Go 1.18 / Unit Tests and Coverage	22s
Linux, Go 1.22 / Benchmarks	3m 42s
Linux, Go 1.22 / Contract Tests	23s
Linux, Go 1.22 / Unit Tests and Coverage	20s
Linux, Go 1.23 / Benchmarks	3m 51s
Linux, Go 1.23 / Contract Tests	30s
Linux, Go 1.23 / Unit Tests and Coverage	26s
	18m 25s

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