Add interruptions to JS SDK (#204)

## Description

Describe your changes.

## Motivation and Context

Why is this change required? What problem does it solve? If it fixes an
open
issue, please link to the issue here.

## Documentation impact

- [ ] Documentation update required
- [ ] Documentation updated [in another PR](_)
- [ ] No documentation update required

## Types of changes

- [ ] Bug fix (non-breaking change which fixes an issue)
- [ ] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to
      not work as expected)

Author: AHGIJMKLKKZNPJKQR

packages/js-server-sdk/src/agent.ts

@@ -76,6 +76,20 @@ export class FishjamAgent extends (EventEmitter as new () => TypedEmitter<AgentE
     return track;
   }
 
+  /**
+   * Interrupt track indentified by `trackId`.
+   *
+   * Any audio that has been sent by the agent, but not played
+   * by Fishjam will be cleared and be prevented from playing.
+   *
+   * Audio sent after the interrupt will be played normally.
+   */
+  public interruptTrack(trackId: TrackId): void {
+    const msg = AgentRequest.encode({ interruptTrack: { trackId: trackId } }).finish();
+
+    this.client.send(msg);
+  }
+
   /**
    * Deletes an outgoing audio track for the agent
    */