chore: rework `gno.land` txtar package #8936

Job	Run time
Run Main (autocounterd) / Go Linter / lint	33s
Run Main (autocounterd) / Go Build / generated	8s
Run Main (autocounterd) / Go Test / test	43s
Run Main (docker-integration) / Go Build / generated	3s
Run Main (docker-integration) / Go Test / test	26s
Run Main (docker-integration) / Go Linter / lint	7s
Run Main (genproto) / Go Build / generated	8s
Run Main (genproto) / Go Linter / lint	37s
Run Main (genstd) / Go Linter / lint	18s
Run Main (genstd) / Go Build / generated	6s
Run Main (genproto) / Go Test / test	42s
Run Main (genstd) / Go Test / test	34s
Run Main (goscan) / Go Build / generated	4s
Run Main (goscan) / Go Linter / lint	11s
Run Main (goscan) / Go Test / test	15s
Run Main (loop) / Go Linter / lint	34s
Run Main (loop) / Go Build / generated	9s
Run Main (loop) / Go Test / test	43s
	6m 21s

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