Keeper registry contract OCR implementation

[infiloop2]

Note: Apologies in advance for the big change, it might be easy to review the new contract instead of individual changes. I also have a notion doc describing the changes, please ping me for link

Since OCR is almost a rewrite I've clubbed some small changes that we've been wanting to do. Here's a list of all changes:

- Implement OCR2Abstract interface in keeper Registry
- Transmit function is the main function now which calls performUpkeep
- Remove perPerformUpkeep and move logic to transmit
- Do not allow withdrawals of funds within performUpkeep
- Consolidate all config into hotvars and storage variables.
- Have two functions - one to set OCR config (setConfig) and one to set OnChainConfig. Both update the configDigest
- Remove setKeepers method and introduce a separate setPayees method
- Refactor checkUpkeep function to return an error enum value instead of reverting. 
- Change performUpkeep to performUpkeepSimulate which would be used in node to simulate user's perform
- Split payment calculation into gasPayment and premium. Use this to distribute payment to keepers
- Rename link/eth to link/native
- Add limits to performData and checkData
- Implement perfromData wrapper and add re-org protection
- Reorganised code in the contract
- Add sig verification skipping option
- Add dynamic overhead calculation
- Add batching of performs
- Polished contract to follow guidelines

[github-actions[bot]]

I see that you haven't updated any CHANGELOG files. Would it make sense to do so?

[github-actions[bot]]

Solana Smoke Test Results

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EVM Smoke Test Results

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EVM Smoke Test Results forwarder_ocr

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EVM Smoke Test Results ocr

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