refactor: hide data source configuration behind dataSystem interface #207

Job	Run time
go-versions / go-versions	3s
Windows, Go 1.23	1m 7s
Windows, Go 1.22	2m 33s
Windows, Go 1.18	47s
Linux, Go 1.18 / Benchmarks	3m 46s
Linux, Go 1.18 / Contract Tests	26s
Linux, Go 1.18 / Unit Tests and Coverage	22s
Linux, Go 1.22 / Benchmarks	3m 38s
Linux, Go 1.22 / Contract Tests	19s
Linux, Go 1.22 / Unit Tests and Coverage	15s
Linux, Go 1.23 / Benchmarks	3m 45s
Linux, Go 1.23 / Contract Tests	22s
Linux, Go 1.23 / Unit Tests and Coverage	22s
	17m 45s

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