@azure/communication-sms_1.2.0-beta.2

Phermanov/opt out api preview (#32008)

### Packages impacted by this PR
communication-sms

### Issues associated with this PR
The purpose of the opt-out management API is to enable customers to
manage opt-out requests for SMS messages. The Opt-Out Management API is
a self-service API that enables businesses to manage opt-out requests
for their SMS campaigns.

### Describe the problem that is addressed by this PR
Adding Opt Out API into JS SDK.

### What are the possible designs available to address the problem? If
there are more than one possible design, why was the one in this PR
chosen?


### Are there test cases added in this PR? _(If not, why?)_
Yes, both regular unit and live tests are added.

### Provide a list of related PRs _(if any)_

### Command used to generate this PR:**_(Applicable only to SDK release
request PRs)_

### Checklists
- [x] Added impacted package name to the issue description
- [ ] Does this PR needs any fixes in the SDK Generator?** _(If so,
create an Issue in the
[Autorest/typescript](https://github.com/Azure/autorest.typescript)
repository and link it here)_
- [x] Added a changelog (if necessary)

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Co-authored-by: Pavlo Hermanov <117445225+phermanov-msft@users.noreply.github.com>