Export types describing all specced media event formats (#4092)

* Export types describing all specced media event formats

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate PR

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Move types to a dedicated export

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Iterate

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

* Add readme entry

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

---------

Signed-off-by: Michael Telatynski <7t3chguy@gmail.com>

src/types.ts

@@ -0,0 +1,24 @@
+/*
+Copyright 2024 The Matrix.org Foundation C.I.C.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+/*
+ * This file is a secondary entrypoint for the js-sdk library, for use by Typescript projects.
+ * It exposes low-level types and interfaces reflecting structures defined in the Matrix specification.
+ *
+ * Remember to only export *public* types from this file.
+ */
+
+export type * from "./@types/media";