Spike: Design for new eosio-util tool

[arhag]

Figure out extensible framework for enabling command line tool that enables nested subcommands with positional and optional arguments, help descriptions, and possibly code completion to use in a new eosio-util tool (and possible in the future as a replacement for the ad-hoc framework used in cleos).

Enumerate initial desired functionality (to be pulled from nodeos, eosio-blocklog, or other programs in the repository dealing with nodeos on-disk files) to capture in this new tool and figure out subcommand breakdown within the tool to capture this functionality.

[vladtr]

Here is a doc I started with proposal/design ideas open for collaboration. Please feel free to edit/contribute:

https://docs.google.com/document/d/1lp6BrfMjOKStkkn6GDcfSq3DKI5Cs-VjEf9afxY15IE/edit?usp=sharing

[stephenpdeos]

@766C6164 to submit proposal PR by EOW to close out this issue

[vladtr]

@stephenpdeos - draft proposal PR is here:

eosnetworkfoundation/product#72