There are some third-party tools that claim to generate all of these things based on the metadata you supply. From what I've seen of those (my opinion only), making everything completely agnostic from a code generation standpoint is almost as cumbersome as developing it from scratch (plus many times I just don't like the code that is being generated).

I'm currently busy with my own little pet project, that will take a source-to-target mapping document (in Excel), and create SSIS packages, table scripts and dimension/fact load scripts from the metadata...using mostly BIML for the SSIS portion. The tricky part to building these types of solutions is to determine how far you should take the code generation piece. You could probably get a 60% solution and take the most mundane tasks (generating tables, base SSIS packages and to some extent the load scripts) out of the equation...but anything more than that and you get into a scenario where capturing/storing the metadata becomes an administrative nightmare.

To answer your question directly: Yes, there are some third-party tools but I would evaluate them very closely before deciding to use it. There are just so many variables involved when creating data marts or data warehouses, and even from your description it seems like no 2 solutions would be the same.

Your best bet in my opinion would be to identify those mundane and time consuming tasks you could automate, and then do so based on your standards and principles. Getting to a 60% solution quickly while enforcing naming conventions etc., and without create an administrative nightmare is already a good step towards a win from my point of view.