feat: partial test files support

[n0izn0iz]

Adds partial support for Test and XTest files.

The biggest missing thing is to support go libs injected in testing likefmt, encoding/json, etc..

There is one regression, injected testing stdlib functions like std.TestSetRealm will not show an error if used in normal .gno files since there is no simple way to use different stdlib sources in normal and test files

This should neverless help to navigate most test sources and help with refactoring by applying symbol renames also in test files

No support for Filetest files

[gfanton]

The biggest missing thing is to support go libs injected in testing like fmt, encoding/json, etc..

One solution could be to initialize a testing store from gnovm/pkg/tests, and either get all the packages from there or simply try to resolve the package using the store.

[gfanton]

it doesn't seems to works on my side..

While opening reader_test.go, I got this error from the server:

2025/01/07 14:17:38 code lens test failed: no package metadata for file file:///Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes/reader_test.gno

2025/01/07 14:17:38 fixImports(filename="/Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes/reader_test.gno"), abs="/Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes/reader_test.gno", srcDir="/Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes" ...

2025/01/07 14:17:38 no highlight: getting package for Highlight: no package metadata for file file:///Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes/reader_test.gno

2025/01/07 14:17:38 code lens test failed: no package metadata for file file:///Users/gfanton/code/gnolang/gno/gnovm/stdlibs/bytes/reader_test.gno

[n0izn0iz]

mmh, there is conflicts when you open stdlibs files due to the testing overlay, I'm not sure how to go about that without modifying some gopls internals
for the record, gopls has multiple problems when you open the golang stdlibs sources

[gfanton]

Let's merge this, as it is still a good improvement from the previous version 👍