feat(storage): Add optional write-through cache to sql store

storage/config.go

@@ -19,6 +19,12 @@ type Config struct {
 	// Type of store
 	// If blank, uses the default in-memory store
 	Type Type `yaml:"type"`
+
+	// Caching is whether to enable caching.
+	// This is used to drastically decrease read latency by pre-emptively caching writes
+	// as they happen, also known as the write-through caching strategy.
+	// Does not apply if Config.Type is not TypePostgres or TypeSQLite.
+	Caching bool `yaml:"caching,omitempty"`
 }
 
 // ValidateAndSetDefaults validates the configuration and sets the default values (if applicable)