Simplify new strategy additions

[skynetcap]

In the current strategies, the following components are manually coded side-by-side with busines logic: ExecutorService, RpcClient, PythPricingSource, SerumManager and other re-used structures. Each strategy also has specific implementations for sending orders, and reading private keys.

Create a new standard that greatly simplifies adding a new class/strategy, such that the following inputs go into a strategy:

• Market ID
• Business logic for the market