graph/db: rename V1Store to Store

The underling store will store gossip messages across gossip versions
and we will instead expose version parameters on many of the methods. So
this interface really just abstracts the underlying store/schema type.

graph/db/kv_store.go

@@ -199,8 +199,8 @@ type KVStore struct {
 }
 
 // A compile-time assertion to ensure that the KVStore struct implements the
-// V1Store interface.
-var _ V1Store = (*KVStore)(nil)
+// Store interface.
+var _ Store = (*KVStore)(nil)
 
 // NewKVStore allocates a new KVStore backed by a DB instance. The
 // returned instance has its own unique reject cache and channel cache.
@@ -804,7 +804,7 @@ func (c *KVStore) DisabledChannelIDs() ([]uint64, error) {
 // returns an error, then the transaction is aborted and the iteration stops
 // early.
 //
-// NOTE: this is part of the V1Store interface.
+// NOTE: this is part of the Store interface.
 func (c *KVStore) ForEachNode(_ context.Context,
 	cb func(*models.Node) error, reset func()) error {