refactor: remove http module

[tgpetrov]

PR Checklist

• The PR title follows our guidelines: https://github.com/NativeScript/NativeScript/blob/master/CONTRIBUTING.md#commit-messages.
• There is an issue for the bug/feature this PR is for. To avoid wasting your time, it's best to open a suggestion issue first and wait for approval before working on it.
• You have signed the CLA.
• All existing tests are passing: https://github.com/NativeScript/nativescript-angular/blob/master/DevelopmentWorkflow.md#running-the-tests
• Tests for the changes are removed.

What is the current behavior?

There is a NativeScriptHttpModule that uses Angular deprecated APIs

What is the new behavior?

• The NativeScriptHttpModule is removed
• @angular/http is removed from the dependencies

Related with #1842 .

BREAKING CHANGES:

• The NativeScriptHttpModule is removed
• @angular/http is removed from the dependencies

Migration steps:

• If using NativeScriptHttpModule, replace with NativeScriptHttpClientModule as done here
• as @angular/http is no longer a peerDependency of nativescript-angular, you can remove if from your dependencies