feat(calling): export getCallingBackend

[gabrielchl]

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[chatgpt-codex-connector]

Export the documented getCallingBackend symbol

When consumers follow the new public API advertised by this change and import getCallingBackend from @webex/calling, the package still has no such named export; this entry point only exports resolveCallingBackend, while the deprecated wrapper's JSDoc also tells users to use getCallingBackend(device). Add or alias the exported function under the documented getCallingBackend name so the new API is actually available.

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