[DTP-949] Initialise LiveObjects pool from state sync sequence

[VeskeR]

This PR is based on https://github.com/ably/ably-js/pull/1887, please review it first.

Tests for SYNC sequence are added in https://github.com/ably/ably-js/pull/1894.

Resolves DTP-949

Summary by CodeRabbit

Summary by CodeRabbit

• New Features

  • Introduced a new method getChannel() in the LiveObjects class for improved channel access.
  • Added new interfaces for better data entry management: LiveCounterDataEntry and LiveMapDataEntry.

• Improvements

  • Enhanced the initialization process of the LiveMap class for better clarity and functionality.
  • Updated handling of state synchronization messages for improved type-checking and performance.
  • Modified the LiveObjectsPool to instantiate LiveMap with enhanced semantics.

• Bug Fixes

  • Adjusted internal logic for better data handling in the LiveObjectsPool and SyncLiveObjectsDataPool classes.