This commit:
- Decouples the coordinator from the state transfer
and moves it to its own package.

- Carves out the transient store from the ledger

- Makes the endorser pass the private simulation results
to the coordinator, for writing to the transient store
and (in future commits) for dissemination

Change-Id: Iadc8528915a0ce50dd44b17b0d0bdfa11487d600
Signed-off-by: yacovm <yacovm@il.ibm.com>