Rename the Input type to GoTemplate

[negz]

Description of your changes

I just realised the examples were updated but the actual kind wasn't. This doesn't matter very much because right now nothing validates the kind, so you could use whatever apiVersion and kind you wanted as long as the struct schemas matched. :)

This does fix the Marketplace entry though, which is a little confusing because it lists the input kind as 'Input' when the examples here are all 'GoTemplate': https://marketplace.upbound.io/functions/crossplane-contrib/function-go-templating/v0.2.1

I have:

• Read and followed Crossplane's contribution process.
• Added or updated unit tests for my change.

[negz]

@ezgidemirel @turkenh if you approve and merge this, could you please cut a v0.2.2 release to update the Marketplace listing?

The process is pretty straightforward:

1. Create and merge a PR to cherry-pick this commit into the release-0.2 branch.
2. Create a new v0.2.2 release using the web UI, from the release-0.2 branch. GItHub will automatically create the tag.
3. Run the CI workflow against the v0.2.2 tag, and tell it to tag the package as v0.2.2

Once CI runs you should see v0.2.2 at https://marketplace.upbound.io/functions.

[ezgidemirel]

LGTM!