…12874)

## Describe your changes

**Problem:**
- Before this fix, we were calling `cleanup` far too often, leading to
unnecessary full component re-renders.
- This is especially egregious in larger custom components, especially
ones that leverage a framework like React.

**Solution:**
- Updates the lifecycle of cleanup to match what we do for all other
elements in Streamlit.


## GitHub Issue Link (if applicable)

## Testing Plan

- Adds unit tests

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**Contribution License Agreement**

By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.

## Describe your changes
The PR updates the docstrings for Custom Components V2.

## GitHub Issue Link (if applicable)

## Testing Plan
n/a docs only

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**Contribution License Agreement**
By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.

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Co-authored-by: Copilot <[email protected]>

## Describe your changes
Docstrings for Streamlit 1.51.0

* More heights and widths for advanced layouts
* `st.space`
* Color for `ProgressColumn`
* Cursor for `st.write_stream`
* Default feedback values

## GitHub Issue Link (if applicable)

## Testing Plan
n/a docstrings only

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**Contribution License Agreement**

By submitting this pull request you agree that all contributions to this
project are made under the Apache 2.0 license.