tsdb editing and mgmt toolz

[goodboy]

with #308 landing shortly we'll have daemon support for storing large time series as part of a trader's normal toolset. one of the main utilities i'm sure most would expect is the ability to edit data sets in a way that's both intuitive and simple.

UX ideas

• allow user selection of datums on a chart and export to a repl (likely ipython shell) which has all the user's computational tools as well as a standard set of tsdb mgmt APIs for "fixing" data that was either written wrong or for overlaying data sets on a whim
• the mgmt APIs will likely want to include:
  • timeseries diffing and duplication detection (the latter for when bad writes happen due to bugs or mistakes)
    • this SO numba solution is probably handy: https://stackoverflow.com/a/71854903
  • tsdb write/delete ability and "reload" functionality, possibly by context-menu style right click
  • export to a format suitable for network transport?
  • gap detection for attempting to find missing history frame segments
• a repl (prolly ipython) which wraps all this in a suitable env (with some extensions?) for doing all the above easily from cli (so likely we'll need IPython integration 😎  goodboy/tractor#306)

main holdups

• marketstore doesn't seem to have any obvious way to delete series segments (Is it possible to remove / delete data? alpacahq/marketstore#264)
• it also has no way to query granularity (No ostensible way of querying granularity and data types alpacahq/marketstore#207) though we are not really planning to ever require dowsampling more then 1m period

Probably more to come as this gets researched more.