feat(recording): record role change event

Reuse `ParticipantStatusChangeEvent` record event, already used by emojis and
webcam streams, to record `UserRoleChangedEvtMsg`.

Role change is stored at `events.xml` as:

- promotion
```
  <event timestamp="2068340" module="PARTICIPANT" eventname="ParticipantStatusChangeEvent">
    <timestampUTC>1622384175759</timestampUTC>
    <date>2021-05-30T14:16:15.759Z</date>
    <status>role</status>
    <userId>w_fowyht7g0tfi</userId>
    <value>MODERATOR</value>
  </event>
```

- demotion
```
  <event timestamp="2071437" module="PARTICIPANT" eventname="ParticipantStatusChangeEvent">
    <timestampUTC>1622384178855</timestampUTC>
    <date>2021-05-30T14:16:18.855Z</date>
    <status>role</status>
    <userId>w_fowyht7g0tfi</userId>
    <value>VIEWER</value>
  </event>
```