feat: version management for Python (requirements.txt) and other languages

[suenot]

Description

Extend version management flags to support more ecosystems beyond Cargo.toml and package.json:

• --version-python — update version in setup.py, pyproject.toml, or requirements.txt
• --version-gradle — update build.gradle
• --version-maven — update pom.xml
• --version-helm — update Chart.yaml

Example

aicommit --version-file version --version-iterate --version-python --push