Add upstream patches

[inaki-amatria]

This PR prepares our fork for integration with the latest upstream changes. By introducing this script and applying upstream patches incrementally, we can avoid dealing with a large, monolithic merge commit. Instead, we will be able to review and reason about each upstream change individually, making the update process more manageable and transparent.

[daniel-otero]

I don't think having the auto-generated files in the paths, adds any value to the process. Quite the contrary, make reading or applying them significantly worse.

Is that really necessary?

[inaki-amatria]

I don't think having the auto-generated files in the paths, adds any value to the process. Quite the contrary, make reading or applying them significantly worse.

Is that really necessary?

Fixed. Including the auto-generated files in the patches doesn't add any value. In fact, as you mentioned, it makes the patches harder to read and apply.

I have now removed them. I was initially concerned about preserving the integrity of each individual patch, but that's not necessary in this case. Also, excluding those files significantly improves the speed of the merge process.