DEMRUM-3111: Core API implementation

[mbudinsky]

Title: DEMRUM-3111: Core API implementation

Description

This PR implements the core React Native API and related native layer bridging.
It supports both the New and Old React Native architecture out-of-box, with added Expo support through a dedicated Expo plugin.
It implements base API tests, with full API suite implemented in an enhanced test application. It also exports the API Jest mocks for SDK consumers.
It brings CI tests with a full architecture matrix.

Checklist

• My code follows the project's coding standards.
• I have run linters/formatters and fixed any issues.
• There are no merge conflicts.
• I have performed a self-review of my code.
• All new and existing tests pass locally.
• I have added license headers to all files.
• (If applicable) I have added unit tests for my changes.
• (If applicable) I have updated the sample app for integration testing.
• (If applicable) I have updated any relevant documentation.

Generative AI usage

• GAI was not used (or, no additional notation is required)
• Coder created a draft manually that was non-substantively modified by GAI (e.g., refactoring was performed by GAI on manually written code)
• GAI was used to create a draft that was subsequently customized or modified
• Code was generated entirely by GAI

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