Datastore Synchronicity Audit

[aschmahmann]

This issue is a placeholder to keep track of which libp2p and IPFS components use Datastores and what level of synchronicity are required from the components.

This is in preparation for implementing #137 and switching the IPFS Badger implementation to have synchronous writes turned off by default.

If you know of any places where the datastore is used and where synchronicity may be required please either add in a comment or just modify this post below this line:

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Adding Files to IPFS: Needs to synchronize after a single Add operation is complete
Removing Files from IPFS: No synchronization required (could be picked up in GC)
Pinning (Add + Remove) from IPFS: Required after each operation
IPNS Updates: Needs to sync after Put
DHT Record Updates: No?
Record Routing Updates: No?
Peerstore: No
Recording Metrics: Probably not

Filestore: ?
Badger: Just enable Sync if async flags is enabled
FlatFS: No
S3: No