[WIP] feat: SDK modernization, automated test cases, speed upgrades

[koraykoska]

This PR is finalized but depends on https://github.com/Uniswap/sdk-core/pull/69 being merged (we will need to update the dependency version in the package.json once the Core SDK has been published)

This is part of the sdk upgrade grant.

Updates

• Removed tsdx (as it's not maintained anymore)
• Added native BigInt support (with backwards compatibility for JSBI)
• Used BigInt for calculations internally everywhere, 100xing the speed of simulations locally
• Modernized the architecture and the code quality
• Added an automated test case generator
• Generated thousands of tests including lots of edge cases (on many different pools)
• Bug fixes

Important backwards compatibility notes

(Similar to the Core SDK updates)

The updates in this PR are fully source-code compatible and non-breaking. But explicit < es2020 projects will not be able to compile it. So, if people use a modern setup, they won't have to change anything in their existing code but can start using native BigInt (and even if not will feel a performance difference). Because of the above, I propose making a major version bump anyways. That way, users will need to explicitly opt-in to the new v3-sdk, but if they do they don't have to update any source code.

[stale[bot]]

Is this still relevant? If so, what is blocking it? Is there anything you can do to help move it forward?

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.

[koraykoska]

Waiting for the core sdk to be merged.