"Fork" the composer to add an auctioneer crate

[itamarreif]

┆Issue Number: ENG-824

We will reuse much of the composer's structure in building the auctioneer. To start, will add a new binary/crate based on composer's structure that will serve as scaffolding for the auctioneer.

Tasks

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1. Add auctioneer crate
2. Get rid of unused config variables from composer
3. Get rid of unused metrics
4. Remove existing Geth and Grpc collectors
5. Remove executor logic