feat: [closes #383] Random number generator seeding

[jeremyckahn]

What this PR does

This PR implements random number generation seeding. The seed state is stored as a URL query parameter rather than the farmhand.state object so that seeded URLs can be shared.

This is a feature designed for speedrunners. With a guaranteed sequence of random numbers, Farmhand's behavior can become completely predictable, thus enabling consistent speedrun experiences.

How this change can be validated

In a Private/Incognito browser session, open the preview URL with an embedded seed query param: https://farmhand-git-feature-383rng-seed-jeremyckahn.vercel.app/?seed=test

Observe that the value of Carrot Seed in the Shop is $21.10. Feel free to test other seed values, this is just a baseline.

Then in another Private/Incognito browser session, open the preview URL without an embedded seed query param: https://farmhand-git-feature-383rng-seed-jeremyckahn.vercel.app/

Observe that the value of Carrot Seed in the Shop is a random value for each new Private/Incognito session.

Additional information

[vercel]

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Name	Status	Preview	Comments	Updated
farmhand	✅ Ready (Inspect)	Visit Preview	💬 Add your feedback	Mar 17, 2023 at 2:51AM (UTC)

[lstebner]

overall i like this approach! just a few questions/comments for you

[jeremyckahn]

Thanks for the helpful review @lstebner! I think we should be set now. It's getting late for me so I'll let this sit and wait to merge and release until tomorrow morning. Feel free to add any comments in the meantime!