feat: support uv

[kemingy]

Try it with:

def build():
    base(dev=True)
    install.uv()
    shell("fish")

[Copilot]

PR Overview

This PR adds support for uv as an alternative to conda for managing Python environments. The changes include new UV-related functions and configurations in the IR package, corresponding starlark builtins and API updates, as well as an end-to-end test to ensure uv installations work correctly.

Reviewed Changes

File	Description
pkg/lang/ir/v1/uv.go	New functions to download and install uv along with uv Python support
e2e/language/python_test.go	Added test case for uv installation with Python
envd/api/v1/install.py	Added a new uv installation function
pkg/lang/ir/v1/interface.go	Added the UV function for configuration in the IR hierarchy
pkg/lang/frontend/starlark/v1/install/install.go	Added starlark builtin for uv installation
pkg/lang/ir/v1/system.go, pkg/lang/ir/v1/types.go, etc.	Integrated UV config into the build process and updated related types and constants

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.