Now `gnodev precompile` and `gnodev test --precompile`
support precompiling imports of the input file or
package.

- `gnodev precompile`: It is enabled by default. You need to pass
addition flag `--skip-imports` to disable it.

- `gnodev test --precompile` precompile imports automatically.

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Fix error `cannot find package...` while running `gnodev test`
by creating temporary go.mod file in the temporary root directory.

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Try to find the nearest go.mod file, run `go build` in the same
folder.

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Currently, `stdlibs/stdshim` contains generated `*.gen.go` files.
While other packages in the stdlibs contains `*.gno` files. Lets
replace generated files with `*.gno` files.

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>

Signed-off-by: Hariom Verma <hariom.verma@tendermint.com>