Rewrite camera shake example (#19724)

# Objective

- Alternative to #19721
- The old implementation had several issues:
  - underexplained
  - bit complicated in places
  - did not follow the source as described
    - camera moves away
    - camera does not use noise
- camera nudges back after shake ends, which looks cinematic, but not
what you want in practice

All in all: the old implementation did not really show a typical
implementation IMO

## Solution

- Rewrite it :D
- I believe the current implementation is a robust thing you can learn
from or just copy-paste into your project

## Testing


https://github.com/user-attachments/assets/bfe74fb6-c428-4d5a-9c9c-cd4a034ba176

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Co-authored-by: Rob Parrett <robparrett@gmail.com>

Author: janhohenheim