[YAP-3]: Adds closure async read API
[YAP-3]: Adds closure async read API

skonb/YapDatabaseExtensions,skonb/YapDatabaseExtensions,DarthMike/YapDatabaseExtensions,skonb/YapDatabaseExtensions,skonb/YapDatabaseExtensions,skonb/YapDatabaseExtensions,DarthMike/YapDatabaseExtensions,DarthMike/YapDatabaseExtensions,danthorpe/YapDatabaseExtensions,danthorpe/YapDatabaseExtensions,danthorpe/YapDatabaseExtensions,DarthMike/YapDatabaseExtensions,DarthMike/YapDatabaseExtensions