Adding support for --token-usage/-t flag

[arilloid]

Fixes #7

Thank you for making the process easier by adding the code for parsing the --token-usage/-t option flag argument from the command line in codeMage.py!

Implementation

I started implementing the feature by adding an if-statement that checks if the option flag was provided to translator.py. At first, if condition was met, my code was simply printing out the token information (that has been extracted from the completion object) to stdout, however, after the first round of testing, I noticed that the token amounts are always equal to 0.

After printing out the completion object, I've realized that completion token details are not being returned by the chosen model (completion_token_details=None).

That is why I added another check to see if completion token details are present in the response. Now, if details about the token usage are present, they get printed to stderr, else - the users will see a message saying that model didn't give any token usage details.

Examples

Running the command with a model that provides token usage details (openai/gpt-3.5-turbo)

Running the command with a model that doesn't

To take advantage of the token usage feature, you can consider allowing users to specify the model of choice, or switching to a model that gives token usage details in its responses.

Changes

Apart from adding the code block with if-statements, I've imported sys at the top of translator.py for printing to stderr, added the info about the new option at the bottom of the README.md.

and updated the help info for flag option in codeMage.py

[gitdevjin]

Instead of using print(), I think you need to use sys.stderr.write("This is an stderr")

[arilloid]

I have changed all of the print() statements to sys.stderr.write()

[gitdevjin]

Thank you so much your contirubution. I merged it to my main branch. It looks really good.
And Yes, I checked that my LLM API for some reason doesn't support the token usage.
I will probably implement the support for other models