Make the bot simple to run by setting appropriate defaults per chain

[NIXBNT]

Enhancement Description

• Summary of the enhancement
  Switching the bot between different chains can be cumbersome and require chain specific knowledge of appropriate exchanges, flashloan tokens and min profit settings.
  By proposing set of default settings for each chain separately, the user interface can be significantly improved.
  Running the chain should be as simple as inputting --blockchain=chain to the click options to get started, then users can optimize accordingly as their domain knowledge grows, rather than knowing the list of suitable flashloan tokens for example.

Solution: A list of click option defaults per chain

Impact Analysis

• Automated Tests: Implications on testing (new/changed)
• Risks: What are the risks associated with this enhancement?
• Performance: Expected performance impacts and how to measure them
• Monitoring: Changes required in the monitoring system
• Logging: Do we need additional logs?
• Documentation: Updates or new documentation needed?