fix: Add missing InstallCLI plugin product

[calvincestari]

Fixes #2682

The .plugin product is missing, effectively 'hiding' the new plugin from SPM and Xcode.

• adds the missing .plugin product
• uses a custom path in the target definition so the menu name can get a space between the two words

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[cwjames19]

@calvincestari After installing v1.0.5 with SPM and Xcode, I still don't see the "Install CLI" option in the menu after I right-click "Apollo" under package dependencies as described in the CLI installation docs.

I've tried selecting different combinations of package products when adding the Apollo package dependency but the result is always the same. I can see the file Apollo/Plugins/InstallCLI/InstallCLIPluginCommand is present, though.

[calvincestari]

That screenshot in the docs is misleading; you need to right-click on your project, not the dependency. It looks like the dependency in the screenshot because of what the name is. I think that screenshot was taken while working in Apollo iOS and not a sample project. I'll get the screenshot updated.

See below:

[cwjames19]

Thank you!