ui.flex is missing many props now

[mofojed]

Description

As a result of ui.flex no longer just accepting **props after PR #810 , it's now missing some props: https://react-spectrum.adobe.com/react-spectrum/Flex.html#props
Add the missing props and document.

Steps to reproduce

1. Add a flex with a height set:

from deephaven import ui

f = ui.flex("Hello", height="size-3000")

Expected results

1. Flex element should appear

Actual results

1. An error is thrown:

r-Scheduler-Serial-1 | .c.ConsoleServiceGrpcImpl | Error running script: java.lang.RuntimeException: Error in Python interpreter:
Type: <class 'TypeError'>
Value: flex() got an unexpected keyword argument 'height'
Line: 3

Versions
Engine Version: 0.36.1
Web UI Version: 0.90.0
Java Version: 11.0.24
Barrage Version: 0.6.0
Browser Name: Chrome 128
OS Name: Linux
@deephaven/js-plugin-plotly-express: 0.11.2
@deephaven/js-plugin-ui: 0.21.0

[mofojed]

@ethanalvizo 's already fixing this as part of his flex docs PR: #785

[dsmmcken]

Duplicate of #824