Add telemetry events for loading extensions (#9793)

* Store extensions versions' wasm API version in the database
* Share a common struct for extension API responses between collab and
client
* Add wasm API version and schema version to extension API responses

Release Notes:

- N/A

Co-authored-by: Marshall <marshall@zed.dev>

crates/collab/migrations.sqlite/20221109000000_test_schema.sql

@@ -374,6 +374,7 @@ CREATE TABLE extension_versions (
     repository TEXT NOT NULL,
     description TEXT NOT NULL,
     schema_version INTEGER NOT NULL DEFAULT 0,
+    wasm_api_version TEXT,
     download_count INTEGER NOT NULL DEFAULT 0,
     PRIMARY KEY (extension_id, version)
 );