Add timeseries data for dYFI emissions

[rossgalloway]

Useful time-series data to have for future dashboards:

• veYFI supply by block
• scaling factor for dYFI.
  • Found here: https://etherscan.io/address/0xC65ac814056fd097ca28850c8466EcE7BB3A8bF5#readContract#F9
  • More info: you can get the emission by looking at the historical Mint events of the minter: 0xC65ac814056fd097ca28850c8466EcE7BB3A8bF5. But of course there are only events from when we moved to partial on-chain governance and onwards
• annual Dyfi Emmissions = scalingFactor * sqrt(veYfiSupply)
• allocation percentages to gauges
• dYFI discount rate can be calculated with veYFI supply and YFI supply, as well as some other variables. Not sure which of these are subject to change, although I think at least the scaling factor (s) is. See https://yearn-docs-h0723nytg.builtby.dad/contributing/governance/veYFI-comp-summary#discount-calculation-formula