feat: setup local virtual environment for build dependencies

[brunoamorim-techlibs]

Problem:
To avoid having to install globally the e2b dependency, add to the setup.sh script an step to install it in a local .venv.

Solution:
Introduced a new function setup_build_venv in setup.sh to create a local virtual environment for build dependencies. The function prompts the user for confirmation and attempts to use uv for a faster setup, falling back to the standard venv if necessary. The virtual environment is activated after creation. This enhancement streamlines the build process by ensuring necessary dependencies are isolated and managed effectively.