[3.2] Add command line option --snapshot-to-json

[ClaytonCalabrese]

Add new command line option --snapshot-to-json which reads given snapshot.bin and generates a JSON equivalent file.

Resolves #151

[spoonincode]

The linked issue mentions that this should not be part of nodeos, and that a separate tool should be created instead.

[heifner]

The linked issue mentions that this should not be part of nodeos, and that a separate tool should be created instead.

Completely agree. Do you want that done as part of this PR or as a separate task?

[spoonincode]

Let's first decide if we want to jump on to an eosio-snapshot like application or do a more through integrated solution by removing eosio-blocklog and have a single eosio-util. If we just go with an eosio-snapshot it's pretty easy to bang that out unlike more broad changes.

[ClaytonCalabrese]

closing due to migration to leap AntelopeIO/leap#24