Add --version flag to CLI

[sammmiksha]

Summary

Adds a --version flag to the CLI using importlib.metadata.version() so the package version is retrieved dynamically at runtime.

Example:

location-tracker --version
location-tracker 2.1.3

Changes

• Added from importlib.metadata import version
• Added argparse --version action in cli()

Verification

• Installed package in editable mode (pip install -e .)
• Verified location-tracker --version outputs the package version
• Ran test suite successfully (51 passed)

[dcondrey]

Good feature, but not passing CI yet:

• ruff format --check fails: the ArgumentParser(...) block got re-indented, leave it as-is.
• ruff check fails (I001): sort the new import.

Run ruff format . + ruff check --fix . and it's good to go.