add phone number support to reddit-conversions-api

[akhsueh]

A summary of your pull request, including the what change you're making and why.

Adding the support of passing phone numbers into the Reddit Conversions API destination (destinations/actions-reddit-conversions-api).

We have configured it to the following default mapping, please let us know if this is not the correct default value from Segment that we should use:

default: {
  '@if': {
    exists: { '@path': '$.properties.phone' },
    then: { '@path': '$.properties.phone' },
    else: { '@path': '$.context.traits.phone' }
  }
}

Testing

• [ X] Added unit tests and they have passed
• [X ] Tested end-to-end using the local server / Actions Tester and checked the final payload in the request that was being sent
• [ X] [If destination is already live] Tested for backward compatibility of destination: didn't notice any issues in the unit tests or end to end test using actions tester
• [Segmenters] Tested in the staging environment
• [Segmenters] [If applicable for this change] Tested for regression with Hadron.

[codeyanker]

Phone number requires treatments similar to email address with sanitizing and hashing before sending over to reddit-conversions-api. Here is a screenshot on the API doc suggesting the necessary steps on phone number processing.

It can be referenced back in "Hashing phone numbers" section under https://ads-api.reddit.com/docs/v2/#section/Prerequisites-and-considerations.

Also a note on testing the new processing function to verify different phone number variants are yielding the same hashed hex value for convergency.