Bug fix rx.toast. Allow passing title kwarg

[TimChild]

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
  Yes

• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?
  Yes

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)

New Feature Submission:

• Does your submission pass the tests?
• Have you linted your code locally prior to submission?

Changes To Core Features:

• Have you added an explanation of what your changes do and why you'd like us to include them? Yes
• Have you written new tests for your core changes, as applicable?
  No -- Did not find any existing tests for toasts, and wasn't sure where to put them.
• Have you successfully ran tests with your changes locally? Current tests all pass

After these steps, you're ready to open a pull request.

a. Give a descriptive title to your PR. -- Done

b. Describe your changes.

• Added title to the ToastProps(PropsBase) so that a validation error isn't raised if title is passed explicitly
• Made message defualt to an empty string for toast.info, toast.error, etc. -- Note: A error is already raised in Toaster.send_toast if message is empty and title/description are not provided

c. Put closes #XXXX in your comment to auto-close the issue that your PR fixes (if such).

• Closes rx.Toast raises validation error if title prop passed explicitly in 0.5.10 #3854

Note: I tested manually (in an example app) with these examples:

def _toasts() -> list:
    return [
        rx.toast("toast('message', level='info')", level="info"),
        rx.toast.info("toast.info('message')"),
        rx.toast.info(message="toast.info(message='message')"),
        rx.toast.info(
            "toast.info('title', description='description')", description="description"),
        rx.toast.info(
            title="toast.info(title='title', description='description')", description="description"),
        rx.toast.info(
            message='message', title="toast.info(message='message', title='title', description='description')", description="description"),  # message is ignored in this case
    ]

I did not find an obvious place to add real unit tests for this. I'm also not sure how I would go about that outside of AppHarness tests.

[picklelo]

awesome, thanks for adding!