Fix mempackage type

[piux2]

this PR fixed the following errors in the stdlibs in this branch

$ go run ./cmd/gno test -v ./stdlibs/bufio
stdlibs/bufio/scan_test.gno:23:12: undefined: bufio.IsSpace (code=gnoTypeCheckError)
stdlibs/bufio/scan_test.gno:193:4: s.MaxTokenSize undefined (type *bufio.Scanner has no field or method MaxTokenSize, but does have unexported field maxTokenSize) (code=gnoTypeCheckError)
stdlibs/bufio/scan_test.gno:229:4: s.MaxTokenSize undefined (type *bufio.Scanner has no field or method MaxTokenSize, but does have unexported field maxTokenSize) (code=gnoTypeCheckError)
stdlibs/bufio/scan_test.gno:353:9: s.ErrOrEOF undefined (type *bufio.Scanner has no field or method ErrOrEOF) (code=gnoTypeCheckError)
stdlibs/bufio/scan_test.gno:408:10: scanner.MaxTokenSize undefined (type *bufio.Scanner has no field or method MaxTokenSize, but does have unexported field maxTokenSize) (code=gnoTypeCheckError)

 go run ./cmd/gno test -v ./stdlibs/bytes
 go run ./cmd/gno test -v ./stdlibs/io
 go run ./cmd/gno test -v ./stdlibs/math
 go run ./cmd/gno test -v ./stdlibs/math/bits
go run ./cmd/gno test -v ./stdlibs/strconv

The root issue:

There are exported variables, such as the IsSpace function in stdlibs/bufio/export_test.gno, that are part of the bufio package and intended to be used only during testing.

The file stdlibs/bufio/scan_test.go belongs to the bufio_test package instead of bufio ( it is declared in the code even though it is in the same bufio directy, so it needs to import from the bufio package as testing package during testing

However, export_test.gno is not imported in this case by the package bufio_test. The type checker treats bufio as a production package and filters out export_test.gno.

[Gno2D2]

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[piux2]

This has already been addressed by other fixes in the mempackage_type branch.