feat: alias window.context to window.ampContext for clarity

[SURYAS1306]

…st issue #30789)

✅ Accomplishments:

Replaced:

window.context.master ➜ window.context.primary

window.context.isMaster ➜ window.context.isPrimary

Added aliases to preserve backward compatibility:

window.context.master still works via aliasing

Updated:

Core implementation

Ad vendor integrations

Tests and related documentation

Verified changes through the test suite (npm test)

🧠 Why This Change Matters

Inclusive Language: Avoids potentially problematic terms like "master/slave"

Zero Breaking Changes: All existing functionality continues to work

Developer Friendly: Provides a clear and forward-looking API

Comprehensive Update: Covers 20+ files across the AMP codebase

🧪 Testing

Ran full test suite with npm test – all tests pass

Manually verified usage in key modules

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