feat: add txtar driver for gnoland integration test #1759

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	36s
test (1.20.x, _test.cmd)	1m 49s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	35s
test (1.20.x, _test.pkg)	1m 1s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	52s
test (1.20.x, _test.gnolang.native)	1m 5s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	47s
test (1.20.x, _test.gnolang.stdlibs)	1m 23s
test (1.20.x, _test.gnolang.realm)	1m 5s
test (1.20.x, _test.gnolang.pkg0)	3m 6s
test (1.20.x, _test.gnolang.pkg1)	7m 56s
test (1.20.x, _test.gnolang.pkg2)	7m 2s
test (1.20.x, _test.gnolang.other)	47s
test (1.21.x, _test.cmd)	1m 36s
test (1.21.x, _test.pkg)	1m 31s
test (1.21.x, _test.gnolang.native)	47s
test (1.21.x, _test.gnolang.stdlibs)	1m 22s
test (1.21.x, _test.gnolang.realm)	1m 2s
test (1.21.x, _test.gnolang.pkg0)	2m 18s
test (1.21.x, _test.gnolang.pkg1)	9m 17s
test (1.21.x, _test.gnolang.pkg2)	5m 24s
test (1.21.x, _test.gnolang.other)	57s
upload-coverage	8s
	52m 26s

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