feat: crm apps with revert APIs

[ashutosh-revert]

Moves Cal's CRM apps to use Revert APIs

Type of change

• New feature (non-breaking change which adds functionality)

How should this be tested?

Demos

• Zoho
• Hubspot
• Salesforce

Scenarios Tested (Zoho, Hubspot, Salesforce)

• A meeting/event gets created inside respective crm
• If contact is not already present it gets created.
• When multiple attendees are present, only the ones that are not already present in the CRM gets created.
• When a meeting gets deleted in Cal, it gets deleted in Pipedrive.
• When a meeting gets updated in Cal, it gets updated in Pipedrive.

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

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[github-actions]

This PR is being marked as stale due to inactivity.

[github-actions]

This PR is being marked as stale due to inactivity.