feat: turn session recording into a plugin (B13)

plugins/session-recording/CHANGELOG.md

@@ -0,0 +1,16 @@
+# Changelog
+
+## 1.0.0
+
+Bundled with Termix 2.9.0.
+
+- Session recording moved out of core's `/session_logs` routes and now serves
+  under `/plugin-api/session-recording` through core's connect pipeline.
+- Owns its data: core's `session_recordings` table is renamed to
+  `p_session_recording_session_recordings` on first activation.
+- New `session-recording.view` permission, given to the admin and user roles.
+- Offers `recordings.writer` to other plugins: `open()`/`append()`/`persist()`
+  for an incremental writer (ssh-terminal), `createFinished()` for a recording
+  already written to disk (remote desktop's guacd recordings).
+- Retention days becomes an admin plugin setting; per-host recording becomes
+  a host plugin setting.