feat: add txtar driver for gnoland integration test #1764

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	35s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	43s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	33s
test (1.20.x, _test.cmd)	1m 9s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	50s
test (1.20.x, _test.pkg)	59s
test (1.20.x, _test.gnolang.native)	43s
test (1.20.x, _test.gnolang.stdlibs)	1m 17s
test (1.20.x, _test.gnolang.realm)	49s
test (1.20.x, _test.gnolang.pkg0)	2m 11s
test (1.20.x, _test.gnolang.pkg1)	7m 51s
test (1.20.x, _test.gnolang.pkg2)	5m 28s
test (1.20.x, _test.gnolang.other)	39s
test (1.21.x, _test.cmd)	1m 33s
test (1.21.x, _test.pkg)	1m 15s
test (1.21.x, _test.gnolang.native)	51s
test (1.21.x, _test.gnolang.stdlibs)	1m 23s
test (1.21.x, _test.gnolang.realm)	1m 5s
test (1.21.x, _test.gnolang.pkg0)	2m 18s
test (1.21.x, _test.gnolang.pkg1)	7m 56s
test (1.21.x, _test.gnolang.pkg2)	5m 36s
test (1.21.x, _test.gnolang.other)	50s
upload-coverage	13s
	46m 47s

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