[WAL-49] Deeplink for intercom on local payments

[JDSM01]

What does this PR do?

Adds a callback to when the user navigates to a support link in a webview

Database changed?

No

Where should the reviewer start?

BillingWebViewFragment.kt IabPresenter.kt TopUpActivityPresenter.kt

How should this be manually tested?

Talk to me for further info

What are the relevant tickets?

https://aptoide.atlassian.net/browse/WAL-49

Code Review Checklist

• [ ] Architecture
• [ ] Documentation on public interfaces
• [ ] Database changed?
• [ ] If yes - Database migration?
• [ ] Remove comments & unused code & forgotten testing Logs
• [ ] Codestyle
• [ ] Functional QA tests pass