Update INSTALL.md with new tooling and instructions

[knguyen1]

Summary

• This is a…
  • Bug fix
  • Feature addition
  • Refactoring
  • Minor / simple change (like a typo)
  • Other
• Describe this change in 1-2 sentences: Updates INSTALL.md to reflect modern tooling changes from CONTRIBUTING.md, incorporating uv as an optional package manager and improving cross-platform installation instructions.

Problem

• JIRA ticket (optional): PICARD-XXX

The INSTALL.md file was outdated and didn't reflect the modern development workflow using uv that was recently added to CONTRIBUTING.md. Users needed updated installation instructions that accommodate both traditional pip workflows and the new uv tooling.

Solution

• Added platform-specific gettext installation instructions for Windows, Linux, and macOS
• Introduced uv as an optional but recommended package manager alongside pip
• Added dedicated "Installation using uv" section with proper virtual environment setup
• Updated "Running From the Source Tree" section with both uv and pip approaches
• Enhanced test running instructions with uv support
• Added "Development Setup" section covering pre-commit hooks and code quality tools
• Improved cross-platform support with proper activation commands for different OS
• Maintained backward compatibility while introducing modern tooling options

Action

Additional actions required:

• Update Picard documentation (please include a reference to this PR)
• Other (please specify below)

[zas]

LGTM

[rdswift]

Looks good to me. I've never used uv or ruff before, and following the steps listed worked perfectly for me (tested on linux).