Replace Deprecated optparse with argparse for Command-Line Parsing

[yy214123]

The current implementation of pyfiglet utilizes the optparse module for parsing command-line arguments.
However, optparse has been deprecated since Python 3.2 in favor of the more powerful and flexible argparse module.

Proposed Changes:
Switch to argparse: Replace all instances of optparse with argparse to handle command-line arguments.

[pwaller]

If someone wants to contribute this, pull requests are welcome.

[yy214123]

Thank you for the positive response!
I will proceed to create a Pull Request to replace optparse with argparse.

[pwaller]

Thanks; bear in mind I may be slow to respond since I'll have a lot going on. If it turns out to be non-trivial to review the requests it may take some time. Please feel free to ping the thread every so often if I go silent.

[stefanor]

FYI, optparse got undeprecated: python/cpython#126227

[yy214123]

FYI, optparse got undeprecated: python/cpython#126227

Thank you for sharing the information. I didn't notice this news.

[pwaller]

As optparse is no longer deprecated I'll close this, but thanks anyway for the suggestion.

If anyone does come up with a good reason to migrate option parsers in the future I would only seriously consider it if it left the option parsing compatible with older versions (i.e. supporting flags as they are used with older versions). I would be reluctant to accidentally change the behaviour of existing scripts.