Conduit: init subcommand

[winder]

Summary

Note: this is building ontop of #1232 so there are some unrelated changes in the diff.

Thinking out loud a little with this PR. I wanted to try out Conduit and getting the basic configuration setup was a little tricky.

Run ./conduit init or ./conduit init -d /path/to/data/directory and a new directory is created along with some instructions:

~$ ./conduit init -d data/conduit_data
A data directory has been created at 'data/conduit_data'.

Before it can be used, the config file needs to be updated
by setting the algod address/token and the block-dir path where
Conduit should write the block files.

Once the config file is updated, start Conduit with:
  ./conduit -d data/conduit_data

Test Plan

New unit test and manual testing.

[codecov]

Codecov Report

Merging #1235 (9a14579) into conduit (ce54ff3) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff            @@
##           conduit    #1235   +/-   ##
========================================
  Coverage    62.06%   62.06%           
========================================
  Files           70       70           
  Lines         9434     9434           
========================================
  Hits          5855     5855           
  Misses        3073     3073           
  Partials       506      506           

Impacted Files	Coverage Δ
conduit/config.go	100.00% <ø> (ø)
conduit/pipeline.go	52.15% <100.00%> (ø)

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[winder]

This passes the flags to the sub commands, which I didn't want.

[AlgoStephenAkiki]

Very very cool