Ledger (syncing) CLI and offline toolset

[goodboy]

As per the prototype started in #489 we need a CLI for the new
.accounting subsystem which allows for syncing trades and transfers
ledgers from brokers/cexes to get up to date (and audited) position
accounting.

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Design/UX refinement

• Prototype ledger cli using typer landed in Rekt pps? problem? => piker.accounting #489 needs
  refinement!

  • need to get some discussion going on what the cmd hierarchy should
    be: piker ledger sync for eg. or just a top level ledger?

• use rich.Table output for console position summary as well as
  the existing little colored text output.

  • existing dumper is in .accounting.cli

• add more subcmds then sync?

  • sync would pull recent trades data from brokers.toml defined backends and write local ledger files
  • edit and or audit commands for checking contents
  • some kinda git save related cmd
  • list to only show local non-synced state?
  • support and document syncing from a backend as the first thing
    a user typically does wen beginning to use the project?
  • consider remote actor support in harmony with a ledgerd service actor
    • see Change Position.clears -> .events #510
  • consideration for a (apache arrow) related binary format
    probably unified with our (eventual) shm / fsp offline storage
    choice.
    • maybe a transformer to TOML when the user wants to read
      manually?

• non-daemonized audit system?

  • ledger -> positions offline calcs audit tool
    • will take in a backend generated ledger file(s) and check it
      against the current pps.toml state, complaining if there's
      a mismatch (depending on user settings and whether it's a paper
      account)

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Testing

• tests for some example paper and certain backend ledgers ensuring
  accounting calcs are correctly generated as output.
  • enter-exit-enter-exit style sequences
  • ^ same but with net short single-transactions in sequence
  • catch some edge cases with crypto mkts that have super low but high
    precision pricing?