excaliburjs / Excalibur / 16107036236

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fix: ex.Random improve unique seeding on constructor w/o provided seed (#3470)

3 files changed

- Random.ts
- 07-random.mdx
- RandomSpec.ts

# Random.ts
added static intialSeed form Date.now() and an incrementing offset.
also, this ensures that the actual seed used is available property
moved public seed  to private _seed
added getter for seed
in constructor(), if no seed provided it pulls from the 'next' seed in the incrementing list

# 07-random.mdx
updated documentation to reflect new functionality

# RandomSpec.ts
-added 2 tests
- will have a seed even if not passed into constructor
- can have sequential random instances with unique seeds

# Checklist for PR
- added tests
- all tests pass locally
- created test project to exercise new logic with favorable results
- updated docs

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