FCE-3471 add sandbox moq methods

[czerwiukk]

Description

Adds sandbox api MoQ methods to the useSandbox hook.

Documentation impact

• Documentation update required
• Documentation updated in another PR
• No documentation update required

Types of changes

• 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)

[linear]

FCE-3471

[Copilot]

Pull request overview

Adds MoQ token retrieval helpers to the useSandbox hook so consumers can request publisher/subscriber tokens from the sandbox API.

Changes:

• Introduces a shared fetchMoqToken(streamName, type) helper for MoQ token fetching.
• Exposes two new hook methods: getSandboxMoqPublisherToken and getSandboxMoqSubscriberToken.
• Updates the hook return object to include the new methods.

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