Forbid PEP750 – Template strings

[sobolevn]

Rule request

Thesis

We need to forbid using https://peps.python.org/pep-0750/ which will be implemented in 3.14 / 3.15

Reasoning

It is like f strings, but even more complex.
We did not allow f strings for many years. And will not allow this code as well.

[skv0zsneg]

I would like to work on this if you don't mind :)

[sobolevn]

sure! but we will have to wait for 3.14b1 and github actions support for it :)

[sobolevn]

We will allow t strings, because they are safer alternative to many other solutions.