feat(clientdata): id is now optional on clientdata.output_*() methods

[cpsievert]

See the changes to CHANGELOG for a description of what this PR adds.

A minimal example:

import matplotlib.pyplot as plt
import numpy as np

from shiny.express import render, session, ui

ui.input_dark_mode()

@render.plot
def myplot():
    plt.figure()
    plt.hist(np.random.normal(size=100))  # type: ignore

    bg_color = session.clientdata.output_bg_color()
    plt.title(f"bgcolor: {bg_color}")

[cpsievert]

@schloerke my memory is a little fuzzy, but I think we had agreed this was OK as is?

[schloerke]

It is good, but I do not want to alter AsyncValueFn.

I'm almost done with a fix.

[schloerke]

@cpsievert This is ready to go. Please take a look at the changes.

Changes:

• Module support has been added / tested
• Module support has been added to ClientData
• We only add the current output name into the ClientData class

[schloerke]

@cpsievert There's an unrelated failure from shinytemplates (@karangattu is fixing) that is preventing auto merging. Please admin merge when ready.

[cpsievert]

Ahh, thank you for the fixes!! 🍻