REPL: [pac pfx] Add Support for inserting records with Patch and Defaults

Currently, if you use the following Power Fx with pac pfx:

Patch(Accounts,
    Defaults(Accounts),
    {
        'Account Name':"Test"
    }
);

It will fail with the error 'Defaults' is a recognized but not supported function.
This is not surprising since Defaults is not listed as a supported function at https://aka.ms/Power-Fx-PAC-CLI

If you omit the Defaults, then it gives the error Error 0-57: Invalid number of arguments: received 2, expected 3 or more.

The work around is to use Collect instead, however folks are mostly used to using Patch with Defaults as described by https://learn.microsoft.com/en-us/power-platform/power-fx/reference/function-patch#overview

Can support for Inserting records using Patch and Defaults be added?

Start with the pac pfx REPL entry point and reproduce the documented Patch with Defaults example from the issue. Trace how supported functions and Patch arguments are handled; done means the expression is accepted and inserts a record without the current unsupported-function or argument-count errors.