chore: rework `gno.land` txtar package #8944

Job	Run time
Run Main (autocounterd) / Go Build / generated	13s
Run Main (autocounterd) / Go Linter / lint	32s
Run Main (docker-integration) / Go Linter / lint	7s
Run Main (autocounterd) / Go Test / test	48s
Run Main (docker-integration) / Go Build / generated	4s
Run Main (docker-integration) / Go Test / test	22s
Run Main (genproto) / Go Build / generated	7s
Run Main (genproto) / Go Linter / lint	36s
Run Main (genproto) / Go Test / test	37s
Run Main (genstd) / Go Build / generated	5s
Run Main (genstd) / Go Linter / lint	22s
Run Main (genstd) / Go Test / test	27s
Run Main (goscan) / Go Build / generated	4s
Run Main (goscan) / Go Linter / lint	15s
Run Main (goscan) / Go Test / test	27s
Run Main (loop) / Go Linter / lint	44s
Run Main (loop) / Go Test / test	48s
Run Main (loop) / Go Build / generated	7s
	6m 45s

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