Use setuptools_scm

[giograno]

This PR introduces setuptools_scm to compute versions for the handcrafted SDK.

We don't use setuptools_scm directly in the generated code (that would require changing the pyproject.toml mustache template; the version parameter is also used in the generated code) but we inject the right version with the following command uvx --from setuptools-scm python -m setuptools_scm.

[giograno]

The way uv uses its lock files is a problem when using dynamic versioning (see more context here). Waiting for some workaround before moving forwards with this.