Feature/futures curve history

[skhan877]

This feature adds the ability for a user to view a futures curve as at a previous date, helping to analyse how the curve has evolved over time (flattened/steepened/etc).

This functionality is available in Bloomberg's equivalent GC<GO> function.

A new --as-of option has been added to the futures/curve function, where the user can enter their desired historical reference date.

curve -t ES --as-of 2022-12-07

If there is data for the date in question, the chart will plot both the latest curve and the chosen historical curve (with appropriate legend to distinguish between the two).

The --raw option will also display the prices for both dates:

NB: also fine in "interactive" mode - I'm just screenshotting the simplified table.

If the user selects an invalid --as-of date (e.g. a weekend or a date prior to the contract existing), the function will revert to just showing the live curve but print an appropriate message nonetheless:

Finally, --as-of is optional, so running the curve command as before still works as it did.

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[jmaslek]

This looks awesome! Will try to get to tomorrow!

Can I be picky and suggest that instead of "--as-of", we do "-d", "--date", which aligns with how we get the treasury curves :)

[skhan877]

Sure thing! Hopefully find time to change it tomorrow.

[skhan877]

Changed to -d and --date as requested.

[jmaslek]

Changed to -d and --date as requested.

Thanks! I added a small patch for the xaxis formatting (doing something like CL was giving a weird grid).