fix: move main entrypoint class to com.embabel.template package

[sivaprasadreddy]

No description provided.

[johnsonr]

This was how the template originally was. While it makes sense from a Spring Boot perspective, it means that if the user adds a package parallel to template it won't be picked up. I wonder if that's something people might try first.

Of course the user might add packages in their own namespace (non embabel) which would require moving the class.

[sivaprasadreddy]

Considering Embabel built on-top of Spring AI, most of the people follow Spring Boot conventions. So, I think the generated code should align with that convention as a good starting point.

[johnsonr]

Agree. Have made this change