feat: addpkg command respects gno.mod file #2599

Job	Run time
build (1.20.x, GOARCH=amd64 GOOS=linux, gno)	27s
build (1.20.x, GOARCH=wasm GOOS=js, gno)	26s
build (1.21.x, GOARCH=amd64 GOOS=linux, gno)	20s
build (1.21.x, GOARCH=wasm GOOS=js, gno)	21s
test (1.20.x, _test.cmd)	1m 8s
test (1.20.x, _test.pkg)	53s
test (1.20.x, _test.gnolang.native)	33s
test (1.20.x, _test.gnolang.stdlibs)	1m 7s
test (1.20.x, _test.gnolang.realm)	45s
test (1.20.x, _test.gnolang.pkg0)	1m 47s
test (1.20.x, _test.gnolang.pkg1)	6m 16s
test (1.20.x, _test.gnolang.pkg2)	4m 43s
test (1.20.x, _test.gnolang.other)	29s
test (1.21.x, _test.cmd)	1m 19s
test (1.21.x, _test.pkg)	51s
test (1.21.x, _test.gnolang.native)	46s
test (1.21.x, _test.gnolang.stdlibs)	1m 3s
test (1.21.x, _test.gnolang.realm)	46s
test (1.21.x, _test.gnolang.pkg0)	1m 51s
test (1.21.x, _test.gnolang.pkg1)	6m 3s
test (1.21.x, _test.gnolang.pkg2)	4m 5s
test (1.21.x, _test.gnolang.other)	35s
upload-coverage	22s
	36m 56s

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