feat: enable inter-realm mode in 'gno run'

[mvertes]

A new -pkgpath flag is added to gno run command in order to enable inter-realm behaviour in standalone local mode.

It allows to run inter-realm test programs under the gno debugger.

Application

Executing realm test programs with gno run doesn't work:

$ cd gnovm
$ go run ./cmd/gno run ./tests/files/zrealm_std4.gno
panic: crossing() is only allowed in realm packages [recovered]
	panic: std_test/./tests/files/zrealm_std4.gno:9:2: crossing() is only allowed in realm packages:
	--- preprocess stack ---
[...]

Now setting a realm identity for the main function:

$ go run ./cmd/gno run -pgkpath gnolang/r/std_test ./tests/files/zrealm_std4.gno
test1 gno.land/r/demo/tests
test2 gno.land/r/demo/tests
test3 gno.land/r/demo/tests

No panic and output is identical to test expected output:

$ cd gnovm/pkg/gnolang
$ go test -run TestFiles/zrealm_std4.gno

And now we can run the test case under the gno debugger:

$ go run ./cmd/gno run -debug -pgkpath gnolang/r/std_test ./tests/files/zrealm_std4.gno

[Gno2D2]

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[codecov[bot]]

Codecov Report

:x: Patch coverage is 51.11111% with 44 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
gnovm/cmd/gno/run.go	16.32%	40 Missing and 1 partial :warning:
gnovm/pkg/gnolang/debugger.go	92.68%	2 Missing and 1 partial :warning:

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