feat: remove label feature

[jianhuihi]

Changes

• Removed all references to the label feature from relevant modules, including label management and associated functions.
• Updated documentation to reflect the removal of this feature.
• Cleaned up tests and removed any label-related test cases.
• Ensured the system functions correctly without the label feature.

Motivation

As per the discussion in issue #1069, the label feature is no longer needed. Removing it helps in reducing code complexity and improving maintainability.

Testing

• Verified that the removal does not break any existing functionality.
• Passed all unit and integration tests.

Related Issues

Fixes #1069

[whiskeysockets-bot]

Thanks for your contribution.

The next step is to wait for review and approval to merge it to main repository

The community can help reacting with a thumb up (:thumbsup:) for approval and rocket (:rocket:) for who has tested it.

To test this PR you can run the following command below:

# NPM
npm install @whiskeysockets/baileys@jianhuihi/Baileys#removelabel
# YARN v2
yarn add @whiskeysockets/baileys@jianhuihi/Baileys#removelabel