style: add category property to commands

[nriviere-gitguardian]

Context

The display of the commands was not standardized: some commands were not prepended by GitGuardian, and the others were using gitguardian instead of GitGuardian.

What has been done

Update package.json to group GitGuardian commands into the GitGuardian category.

Validation

Open the command palette and verify that GitGuardian commands are prepended by GitGuardian:

[sevbch]

So you've added "category": "GitGuardian" for all commands, but in your screenshot, where is the GitGuardian: prefix coming from? Isn't going to be doubled? (or is it already coming from this PR?)

[salome-voltz]

Thank you ! 🙏

[nriviere-gitguardian]

So you've added "category": "GitGuardian" for all commands, but in your screenshot, where is the GitGuardian: prefix coming from? Isn't going to be doubled? (or is it already coming from this PR?)

It's coming from the views property: the VS Code automatically adds commands to open the views and prepend the command by the name of the extension, GitGuardian in this case.

I've added a commit to fix some case issues in the views names.