Implemented switch for anonymous calling.

[jiriburant]

Purpose

DO NOT MERGE! Awaiting release of new SDK.

This PR aims to add switch to allow anonymous calling. It introduces new toggle "Hide caller Id" for ACS PSTN calls.

Does this introduce a breaking change?

[ ] Yes
[ x] No

Pull Request Type

What kind of change does this Pull Request introduce?

[ ] Bugfix
[z ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[ ] Documentation content changes
[ ] Other... Please describe:

How to Test

• Get the code

git clone [repo-address]
cd [repo-name]
git checkout [branch-name]
npm install

• Test the code
  Fill in necessary info for starting a PSTN outbound call (alternateId of purchased number and destination number), check the Hide caller id toggle and start a call.

What to Check

Verify that the following are valid
Verify on the receiving phone, that the call is anonymous (the device displays "masked number" or "hidden", etc.)

Other Information

The PR is currently awaiting release of new SDK, which will contain the anonymous calling functionality.