feat(IM-1857): adding aws sns subscription support

[dario-commercetools]

Link to the Jira issue

https://commercetools.atlassian.net/browse/IM-1857

Description and context

Adding SNS support for event applications

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Brief description of the solution

How was it tested?

Instructions to build/test locally

Depends on another PR/branch?

• No
• Yes - dependant on PR/branch:

Checklist-

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• I joined a screenshot of the app before and after the fix.

[upload the screenshot here]

[changeset-bot]

⚠️ No Changeset found

Latest commit: 480e4ad

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[abreu-ct]

We need to release #1689 before merging this.

[abreu-ct]

🚀