Added solidityKeccak256 Function

[arimgibson]

Closes #66

• Added solidityKeccak256 function based off ethers.js
• Added testing, checking match with ethers.js for multiple types
• Added inline documentation using TypeDoc
• Add toTwos method onto TinyBig -- @dawsbot
• Add test for different types in the same function call

Improvements to be added after MVP functionality

• Clean up code and flatten function
• Create and export keccak256 function, which the solidityKeccak256 function relies on
• Update test for static bytes arrays (e.g. bytes5[3]) after determining if this is a bug in both ethers.js and essential-eth
  Added solidityKeccak256 Function #77 (review)

Polyfill buffer - No longer needed as other essential-eth functions aren't polyfilled

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Name	Status	Preview	Updated
essential-eth	✅ Ready (Inspect)	Visit Preview	Apr 21, 2022 at 10:55PM (UTC)

[arimgibson]

@dawsbot I added a task to add the toTwos method onto the TinyBig class, which is needed for the pack helper function

[dawsbot]

@arimgibson sounds great, I'll take on the toTwos here in a moment

[arimgibson]

@dawsbot this input [[15]] should be valid in theory but fails in both essential-eth and ethers because essential-eth relies on code I believe to be broken that comes from ethers. Parsing in an array triggers the _pack fn to call itself passing the isArray parameter as true https://github.com/Earnifi/essential-eth/blob/675424d214951ba0dcf3be071cf5c6e641bd2578/src/utils/solidity-keccak256.ts#L85 which triggers _pack to add zeros stored in the Zeros const https://github.com/Earnifi/essential-eth/blob/675424d214951ba0dcf3be071cf5c6e641bd2578/src/utils/solidity-keccak256.ts#L11-L12 to the original 15 value passed in https://github.com/Earnifi/essential-eth/blob/675424d214951ba0dcf3be071cf5c6e641bd2578/src/utils/solidity-keccak256.ts#L67 This then triggers arrayify to throw an error because the number passed in is too large https://github.com/Earnifi/essential-eth/blob/675424d214951ba0dcf3be071cf5c6e641bd2578/src/utils/bytes.ts#L101 Any thoughts on remedying this? We could aim to fix this functionality in essential-eth, but then it won't match ethers. From what I can tell, this seems like a bug in ethers opposed to expected functionality

[dawsbot]

@arimgibson can you create a GH issue in ethers?

Let's merge it as-is since it matches ethers for now.