Differentiate between interfaces and structs in outline

[karthikraobr]

This PR fixes the code outline from erroneously displaying structs as interfaces.

Before

After

[karthikraobr]

@ramya-rao-a No idea why the test failed :(

[ramya-rao-a]

Using document.getText(range).includes('struct') can give us false positives.
Instead fetch just the first line and use a regular expression to check struct definition.

[ramya-rao-a]

@karthikraobr I think I am missing something here...

Below is the screenshot from using the latest Go extension

The interface and struct are appearing separately for me without the changes in this PR.

What am I missing?

[karthikraobr]

@ramya-rao-a I am on the latest version of vscode and the plugin as well. But doesn't work for me. Moreover, a struct being displayed as a class is wrong. Finally, I might be wrong , but there is no code to detect classes right? Are you using a beta?

[ramya-rao-a]

Weird, I don't see that anymore..
Must have been some other extension.

I have pushed a commit to make the regex cover scenarios with extra spaces and make it stricter to match the current struct only.

Can you update the test case?

[karthikraobr]

@ramya-rao-a Thanks a ton for fixing the regex. I have added tests for struct outline. Let me know if I need to add more tests.

[karthikraobr]

This PR also fixes breadcrumbs for go files.

[ramya-rao-a]

Thanks @karthikraobr!