Add forward looking APY timeseries for curve vaults

[murderteeth]

what

Right now kong supports a simple pps delta APY. For Yearn's Curve based vaults and strategies we also want to provide a forward looking APY. We can do this because,

..."future looking" apr based on our curve strategies which we can predict because:

• we know emissions rate + boost
• know extra token rewards + rates
• know yearn/convex/etc fees

(wavey)

so what

Forward (aka future or estimated) APY gives a better picture of how an investment will perform in the near future. This is especially useful for new products where backward looking metrics (eg pps delta) are undefined.

now what

• Add a timeseries hook for v2 vaults
  • Filter for Curve products
  • Port the forward looking apy logic from ydaemon, https://github.com/yearn/ydaemon
• Add latest fwd apy to snapshot hook for v2 curve vaults
• Add fwd apy graphql vault typedef and vault resolver
• Specifically test that we match values for https://yearn.fi/vaults/1/0xf165a634296800812B8B0607a75DeDdcD4D3cC88