feat(repl): improve support of multi-line statements #2011

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	41s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	44s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	49s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	40s
test (1.20.x, _test.cmd)	57s
test (1.20.x, _test.pkg)	57s
test (1.20.x, _test.gnolang.native)	32s
test (1.20.x, _test.gnolang.stdlibs)	1m 3s
test (1.20.x, _test.gnolang.realm)	34s
test (1.20.x, _test.gnolang.pkg0)	1m 55s
test (1.20.x, _test.gnolang.pkg1)	7m 58s
test (1.20.x, _test.gnolang.pkg2)	5m 18s
test (1.20.x, _test.gnolang.other)	24s
test (1.21.x, _test.cmd)	1m 41s
test (1.21.x, _test.pkg)	1m 22s
test (1.21.x, _test.gnolang.native)	1m 6s
test (1.21.x, _test.gnolang.stdlibs)	1m 31s
test (1.21.x, _test.gnolang.realm)	1m 0s
test (1.21.x, _test.gnolang.pkg0)	2m 53s
test (1.21.x, _test.gnolang.pkg1)	9m 39s
test (1.21.x, _test.gnolang.pkg2)	5m 32s
test (1.21.x, _test.gnolang.other)	53s
upload-coverage	9s
	48m 18s

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