feat(CE): Added Mixpanel Destination Connector

[xyfer17]

Description

• Add Mixpanel Destination Connector
• Add Unit Test for Mixpanel Connector

Related Issue

Relates to issue #396 Mixpanel: Destination Connector

Type of Change

• [x] New feature (non-breaking change which adds functionality)
• [x] New Connector (Destination or Source Connector)
• [ ] Refactoring
• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Styling change
• [ ] Breaking change (fix or feature that would impact existing functionality)
• [ ] Documentation update
• [ ] Chore

How Has This Been Tested?

Checklist:

• [x] Added unit tests for the changes made (if required)
• [x] Ensure a branch name is prefixed with feature, bugfix, hotfix, release, style or chore followed by / and branch name e.g feature/add-salesforce-connector
• [x] Have you made sure the commit messages meets the guidelines?
• [ ] Added relevant screenshots for the changes
• [x] Have you tested the changes on local/staging?
• [x] Added the new connector in rollout.rb
• [x] Have you updated the version number of the gem?
• [ ] Have you ensured that your changes for new connector are documented in the docs repo or relevant documentation files?
• [x] Have you updated the run time dependency in multiwoven-integrations.gemspec if new gems are added
• [x] Have you made sure the code you have written follows the best practises to the best of your knowledge?

[TivonB-AI2]

@xyfer17 Resolve conflicts please. Will review/approve when ready

[xyfer17]

@TivonB-AI2 have resolved the confilcts, please check.

[xyfer17]

@TivonB-AI2 review ^^^

[TivonB-AI2]

@xyfer17 Do you possible have a test script for this? If you can, will you share it with me on Slack via DM

[xyfer17]

@xyfer17 Do you possible have a test script for this? If you can, will you share it with me on Slack via DM

sure