ci: add support for testing minimum Go version #139

Job	Run time
go-versions / go-versions	5s
Windows, Go 1.22	2m 17s
Windows, Go 1.21	2m 14s
Windows, Go 1.19	57s
Linux, Go 1.19 / Unit Tests and Coverage	1m 7s
Linux, Go 1.19 / Contract Tests	29s
Linux, Go 1.19 / Benchmarks	3m 53s
Linux, Go 1.21 / Benchmarks	3m 44s
Linux, Go 1.21 / Unit Tests and Coverage	1m 10s
Linux, Go 1.22 / Contract Tests	24s
Linux, Go 1.21 / Contract Tests	17s
Linux, Go 1.22 / Unit Tests and Coverage	1m 15s
Linux, Go 1.22 / Benchmarks	3m 45s
	21m 37s

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