[feat]: add useSpringValue

[joshuaellis]

What

• Adds useSpringValue hook
• Adds internal useConstant hook
• Adds jsdoc to some hooks
• Adds macos-dock demo

Checklist

• Documentation updated
• Demo added
• Ready to be merged

[changeset-bot]

🦋 Changeset detected

Latest commit: 2945748

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 12 packages

Name	Type
@react-spring/core	Minor
@react-spring/shared	Minor
@react-spring/animated	Minor
@react-spring/parallax	Minor
@react-spring/rafz	Minor
react-spring	Minor
@react-spring/types	Minor
@react-spring/konva	Minor
@react-spring/native	Minor
@react-spring/three	Minor
@react-spring/web	Minor
@react-spring/zdog	Minor

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Name	Status	Preview	Updated
react-spring-beta	✅ Ready (Inspect)	Visit Preview	Dec 1, 2022 at 9:51AM (UTC)

[codesandbox-ci]

This pull request is automatically built and testable in CodeSandbox.

To see build info of the built libraries, click here or the icon next to each commit SHA.

Latest deployment of this branch, based on commit 2945748:

Sandbox	Source
Animating Auto	Configuration
Card	Configuration
Cards Stack	Configuration
Chaining Transition and a Spring	Configuration
CSS Gradients	Configuration
CSS Keyframes	Configuration
Async CSS variables	Configuration
Draggable List	Configuration
Exit Before Enter	Configuration
Flip Card	Configuration
Floating Button	Configuration
Goo Blobs	Configuration
Image Fade	Configuration
List Reordering	Configuration
MacOS Dock	Configuration
Masonry Grid	Configuration
Multistage Transitions	Configuration
Noise	Configuration
Notification Hub	Configuration
Horizontal Parallax	Configuration
Sticky Parallax	Configuration
Vertical Parallax	Configuration
Rocket decay	Configuration
Basic Transition	Configuration
Native Slide	Configuration