Split ledger.py into more modules

[a1denvalu3]

Ledger is becoming too large and monolithic. It would be nice to split it into more modules.

[KvngMikey]

would love to pick this up, when this PR goes in => #878

[edgarmuyomba]

hey @KvngMikey
are you still up for this or I can pick it up?

[KvngMikey]

@edgarmuyomba , i'm working on it.