Enhancement(Integration): Pinterest Tag event_id added for deduplication + custom event support

[shrouti1507]

Adding deduplication support for pinterest_tag Ref: https://view.highspot.com/viewer/629a4a9284742fae381c6804 Also, adding "custom" event support, if event sent by the user doesn't match the internal mapping or event mapping in webapp.

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Type of change

• [ ] Bug fix (non-breaking change that fixes an issue)
• [x] New feature (non-breaking change that adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)

Related issues

Fix #1

Checklists

Development

• [ ] Lint rules pass locally
• [ ] The code changed/added as part of this pull request has been covered with tests
• [ ] All tests related to the changed code pass in development

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• [ ] This pull request has a descriptive title and information useful to a reviewer. There may be a screenshot or screencast attached
• [ ] "Ready for review" label attached to the PR and reviewers mentioned in a comment
• [ ] Changes have been reviewed by at least one other engineer
• [ ] Issue from task tracker has a link to this pull request

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