WOETH yield buckets

[sparrowDom]

This is the third attempt at the implementation of limiting the yield increase and, consequen the exchange rate between WOETH and OETH. The other 2:

• https://github.com/OriginProtocol/origin-dollar/pull/2106
• https://github.com/OriginProtocol/origin-dollar/pull/2421

This approach:

• does the internal accounting of credits the same way https://github.com/OriginProtocol/origin-dollar/pull/2106 does it
• the WOETH exchange rate is in sync with OETH yield as long as it doesn't surpass the 91% yearly yield rate. In such case the yield is delayed and will be distributed over the next yield period. Which lasts 23 hours
• similarly to https://github.com/OriginProtocol/origin-dollar/pull/2421 this PR requires interaction with the contract in order to increase the exchange rate / start new yield period by calling increaseYieldLimit()

To be completed before internal review begins:

• [ ] The contract code is complete
• [ ] Executable deployment file
• [ ] Fork tests that test after the deployment file runs
• [ ] Unit tests *if needed
• [ ] The owner has done a full checklist review of the code + tests

Internal review:

• [ ] Two approvals by internal reviewers

[github-actions[bot]]

	Warnings
:warning:	:eyes: This PR needs at least 2 reviewers

Generated by :no_entry_sign: dangerJS against b68269df644f05a6329c1ee260fd334733e972a0

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.21053% with 3 lines in your changes missing coverage. Please review.

Please upload report for BASE (sparrowDom/woeth_hack_proof@79af39f). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
contracts/contracts/token/WOETH.sol	84.21%	3 Missing :warning:

Additional details and impacted files

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##             sparrowDom/woeth_hack_proof    #2447   +/-   ##
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  Branches                               ?     1294           
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  Hits                                   ?     2313           
  Misses                                 ?     2581           
  Partials                               ?        4           

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[sparrowDom]

closing in favour of this one: https://github.com/OriginProtocol/origin-dollar/pull/2453