Add staking plugin to replace other system checks

[raymondjacobson]

Description

New plugin replaces functionality previously held in sauron repo.
Endpoints will return 400 if criteria is not met.

http://localhost:6004/init-round

{
status: "Last funded block is recent enough",
lastFundedBlockNumber: 21533381,
latestBlock: 21547265,
fundingRoundBlockDiff: 46523,
blockDiff: 13884
}

http://localhost:6004/balance?address=redacted&chain=eth&minBalance=100000000000000000

{
balance: "252261215123204715",
eth: "0.252261215123204715",
minBalance: "100000000000000000",
status: "above min balance"
}

http://localhost:6004/balance?address=redacted&chain=solana&minBalance=10000000000

{
balance: "42223956324",
sol: "42.223956324",
minBalance: "10000000000",
status: "above min balance"
}

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide repro instructions & any configuration.

npm run dev

per instructions in readme

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Latest commit: d367624

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[alecsavvy]

Sweet!