feat(reflector): adds debug prop and improves depth blurring

[emmelleppi]

Why

the previous reflector added the depth texture to the shader but the fading of the reflection in function of the depth was not perceptible

• Documentation updated
• Storybook entry added
• Ready to be merged

Closes #293

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Sandbox	Source
vigilant-greider-f4fo7	Configuration
drei reflector	Configuration
arc-x-pmndrs-colors	Configuration
lucid-kapitsa-i5w04	Issue #293

[joshuaellis]

Can we tackle issue #277 in this PR, please? Unless you've already done it and I'm being silly.

[emmelleppi]

Can we tackle issue #277 in this PR, please? Unless you've already done it and I'm being silly.
@gsimone is the example I put in the storybook okay or were you thinking of something different (adding tweaks, multiple stories, etc.)?

[gsimone]

Gonna merge when Marco is ready with the demo ✌️

[joshuaellis]

Gonna merge when Marco is ready with the demo

I'll leave this for you to merge.

[emmelleppi]

Gonna merge when Marco is ready with the demo ✌️

New reflector: https://codesandbox.io/s/frosty-reflector-23xxw
Old reflector: https://codesandbox.io/s/frosty-reflector-old-version-uox4t

I have also added various combinations in the storybook

[github-actions]

🎉 This PR is included in version 3.5.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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