getProvider
@Nullable()
Get a previously loaded provider for a given iota type. Returns the fallback provider if the type is null or no provider was found for that type, or null if the fallback provider has not yet been loaded.
@Nullable()
Get a previously loaded provider for a given iota type. Returns the fallback provider if useFallback is true and either the type is null or no provider was found for that type, or null if useFallback is false or the fallback provider has not yet been loaded.