Split up project into separate components + responsibilities about bankroll HOT 5 CLOSED

I suppose we can just put all the analysis bits into the CLI and notebooks repo for now, since those things will all be used in concert anyways (and the value of analysis to other software is dubious).

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Creating things under https://github.com/bankroll-py

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Started thinking about how to isolate third-party dependencies to as small a region as possible, so I ended up adding a marketdata component:

digraph {
  rankdir = BT;
  { rank = min; model; }
  { rank = same; ibkr; schwab; fidelity; vanguard; }
  { rank = max; cli, notebooks }
  ibkr, schwab, fidelity, vanguard, marketdata -> model
  ibkr, schwab, fidelity, vanguard -> "plugin framework" [style=dashed]
  
  ibkr -> marketdata [style=dashed]
  ibkr -> ib_insync
  marketdata -> rx
  rx [style=dotted]
  ib_insync [style=dotted]
  
  analysis -> model
  analysis -> pandas
  pandas [style=dotted]
  
  notebooks -> analysis, "plugin framework", marketdata
  cli -> analysis, "plugin framework", marketdata
}

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Not really happy with this generic analysis component, though. Feels like it'll just be a dumping ground. @joshvera, any thoughts on how to proceed in that area specifically?

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To do:

• bankroll.model
• bankroll.broker ("plugin framework")
• bankroll.brokers.fidelity
• bankroll.brokers.ibkr
• bankroll.brokers.schwab
• bankroll.brokers.vanguard
• bankroll.marketdata
• Update bankroll repo to just contain CLI and notebooks: #102
• analysis?

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