private Extensions internalRegisterHandlerFactory(ExtensionHandlerFactory extensionHandlerFactory) {
        extensionHandlerFactories.add(0, extensionHandlerFactory);
        return this;
    }
Retrieves all extension metadata for a specific extension type.

@param extensionType    The extension type
@param extensionFactory The extension factory for this extension type
@return A {@link ExtensionMetadata} object describing the extension handlers and customizers for this extension type

@since 3.38.0
core/src/main/java/org/jdbi/v3/core/extension/Extensions.java