`fast-forward` command

[liamaharon]

Original issue: paritytech/substrate#13887

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Partial paritytech/polkadot-sdk#178

Restore the fast-forward in a way to support any chain without adding additional cli complexity.

• Support arbitrary inherents required by the runtime. idea:
  • Create a file inherents_configurations.rs containing inherent configurations similar to https://github.com/paritytech/substrate/blob/master/utils/frame/try-runtime/cli/src/block_building_info.rs
  • When a command like fast-forward that requires inherents is used, the CLI will attempt to build blocks using each of these inherent options until it finds one that works
  • If it finds one that works, it will memoize it for the rest of the run
  • If it cannot find one that works it exits with a helpful message to the user linking to documentation explaining how to add their inherent configuration to inherents_configurations.rs