Add ArgMojo v0.1.0 - A command-line argument parser library for Mojo

[forfudan]

Checklist

• My recipe.yaml file specifies which version(s) of MAX is compatible with my project (see here for an example). If not, my package is compatible with both 24.5 and 24.6.
• License file is packaged (see here for an example).
• Set the build number to 0 (for new packages, or if the version changed).
• Bumped the build number (if the version is unchanged).

Overview

ArgMojo (Github: https://github.com/forfudan/argmojo) provides a builder-pattern API for defining and parsing command-line arguments in Mojo. It currently supports:

• Long options: --verbose, --output file.txt, --output=file.txt
• Short options: -v, -o file.txt
• Boolean flags: options that take no value
• Positional arguments: matched by position
• Default values: fallback when an argument is not provided
• Required arguments: validation that mandatory args are present
• Auto-generated help: --help / -h (no need to implement manually)
• Version display: --version / -V (also auto-generated)
• -- stop marker: everything after -- is treated as positional
• Short flag merging: -abc expands to -a -b -c
• Attached short values: -ofile.txt means -o file.txt
• Choices validation: restrict values to a set (e.g., json, csv, table)
• Metavar: custom display name for values in help text
• Hidden arguments: exclude internal args from --help output
• Count flags: -vvv → get_count("verbose") == 3
• Positional arg count validation: reject extra positional args
• Negatable flags: --color / --no-color paired flags with .negatable()
• Mutually exclusive groups: prevent conflicting flags (e.g., --json vs --yaml)
• Required-together groups: enforce that related flags are provided together (e.g., --username + --password)
• Long option prefix matching: allow abbreviated options (e.g., --verb → --verbose). If the prefix is ambiguous (e.g., --ver could match both --verbose and --version), an error is raised.