Templates SDK JS - Use classes instead of interface

[mishushakov]

Change

In JavaScript specifically this is implemented using interfaces unlike classes in Python. I've found some issues with the interfaces-based approach - you're able to pass empty TemplateBase to Template.build when you are not supposed to and also there was also much duplication in types.ts.

It's also probably not safe at all when using pure JS without TypeScript as you won't see compiler errors.

it was working until this point, because we had other methods on the TemplateFinal interface, but it's now empty so it doesn't match anything anymore.

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[mishushakov]

it doesn't have to because base image will always be specified