Calls support

[Secreto31126]

As mentioned in #432, this update will add Calls API support to the library, including API methods and webhooks.

Things missing:

• Documentation
• Testing 😭
• Interactive Request Call message

Please don't delete this checklist! Before submitting the PR, please make sure you do the following:

• It's really useful if your PR references an issue where it is discussed ahead of time.
• This message body should clearly illustrate what problems it solves.
• Ideally, include a test that fails without this PR but passes with it.

Tests

• Run the tests with npm run test and lint the project with npm run lint and npm run prettier

[github-actions]

Visit the preview URL for this PR (updated for commit fe114ef):

https://whatsappapijs--pr434-calls-support-sk8vwcri.web.app

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[Secreto31126]

call_permission_request seems to be broken on the API side...