chat() function

[asaficontact]

For the following function, do:

• Implement the function if it is not already added
• Refactor function if necessary
• Compare the parameters against Ollama and Ollama-Python
• Write documentation for the function
• Write tests for the function (follow conventions/tests here) and test with testthat::test()

See generate() function for template. generate() is a complete function with all features and has passed all tests.

[asaficontact]

Done with most of the tests, compare the parameters, and then finalize any additional tests that need to be added, then we are good to go with the function.

[hauselin]

Function needs refactoring and additional testing. See generate() function for examples and also see edits above^^