feat(stdlibs): add package `strconv` #8315

Job	Run time
Run Main (autocounterd) / Go Linter / lint	26s
Run Main (autocounterd) / Go Build / generated	12s
Run Main (autocounterd) / Go Test / test	29s
Run Main (docker-integration) / Go Linter / lint	7s
Run Main (docker-integration) / Go Build / generated	6s
Run Main (docker-integration) / Go Test / test	20s
Run Main (genproto) / Go Build / generated	13s
Run Main (genproto) / Go Linter / lint	31s
Run Main (genproto) / Go Test / test	41s
Run Main (genstd) / Go Build / generated	6s
Run Main (genstd) / Go Linter / lint	19s
Run Main (genstd) / Go Test / test	30s
Run Main (goscan) / Go Linter / lint	20s
Run Main (goscan) / Go Build / generated	9s
Run Main (goscan) / Go Test / test	20s
Run Main (logos) / Go Build / generated	8s
Run Main (logos) / Go Linter / lint	26s
Run Main (logos) / Go Test / test	45s
Run Main (loop) / Go Build / generated	7s
Run Main (loop) / Go Linter / lint	1m 5s
Run Main (loop) / Go Test / test	46s
	8m 6s

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