Allow unsubscribe from the conversation subscribe API

[iAmmar7]

Description

The PR will allow the user to unsubscribe from the conversation API.

Type of change

• [ ] Internal refactoring
• [ ] Bug fix (bugfix - non-breaking)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Code snippets

const { unsubscribe } = await client.conversation.subscribe(() => { ... })
unsubscribe();

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 68cb07994af4560c8d928ef77ad96a5146f652df

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

| Name | Type | | -------------- | ----- | | @signalwire/js | Patch |

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[iAmmar7]

@jpsantosbh sure, I will create a PR over there as well.

Could you please review this one more time? I have just updated the variable name and if condition for consistency.