refactor: isolate SDK Realm configuration from host application

[Balamurugan-Testpress]

• The SDK previously relied on Realm’s global default configuration, which could affect Realm usage in the host application.
• This happened because the SDK did not restrict the Realm schema and used the shared configuration.
• This is fixed by introducing a dedicated SDK Realm configuration with restricted objectTypes and ensuring the SDK always opens Realm using that configuration.

References:
realm/realm-swift#2807
https://stackoverflow.com/questions/30492098/multiple-realms-with-multiple-data-models

[gemini-code-assist]

Summary of Changes

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This pull request addresses a critical issue where the SDK's usage of Realm could interfere with a host application also using Realm. By introducing a dedicated and isolated Realm configuration for the SDK, it ensures that the SDK operates within its own defined schema and file, preventing unintended interactions and improving robustness for applications integrating the SDK.

Highlights

• SDK Realm Configuration Isolation: The SDK's Realm configuration is now isolated from the host application's Realm configuration to prevent potential conflicts and ensure independent operation.
• Dedicated Realm Configuration: A dedicated Realm.Configuration (TPStreamsSDK.realmConfig) has been introduced for the SDK, specifying its own schema (objectTypes: [LocalOfflineAsset.self]) and file path.
• Explicit Realm Initialization: All Realm instances within the SDK now explicitly use TPStreamsSDK.realmConfig instead of relying on the global default configuration.

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Changelog

• Source/Database/ObjectManager.swift
  • Updated the Realm initializer to use TPStreamsSDK.realmConfig.
• Source/TPStreamsSDK.swift
  • Added a new static property realmConfig to store the SDK's specific Realm configuration.
  • Refactored the initializeDatabase method to utilize the new buildRealmConfig function.
  • Introduced buildRealmConfig to create and return a Realm.Configuration with a specific file path and objectTypes (specifically LocalOfflineAsset.self).

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request effectively isolates the SDK's Realm configuration, preventing potential conflicts with a host application. This is a valuable improvement. However, the current implementation introduces some significant risks. The use of try! for Realm initialization could lead to crashes in the host application, which is a critical issue for an SDK. Furthermore, the changes break testability by hardcoding the database configuration, which will cause problems for the existing test suite. I've provided specific suggestions to address these points and improve the overall robustness of the code.