Fix URLSearchParams.forEach() crash and spec compliance

[adrian-niculescu]

Fixes URLSearchParams.forEach() to match the spec.

Equivalent fix for iOS: NativeScript/ios#327

Problem

Calling url.searchParams.forEach() in NativeScript Android crashed with an uncaught NativeScriptException.

Fixes

1. Crash: Added error handling for callback->Call() return value
2. Argument order: Changed from (key, value) to (value, key, searchParams)
3. Duplicate keys: Use get_entries() iterator instead of get_keys() + get()
4. thisArg: Support the optional second parameter

Changes

• test-app/runtime/src/main/cpp/URLSearchParamsImpl.cpp
• test-app/app/src/main/assets/app/tests/testURLSearchParamsImpl.js

Known Limitations (pre-existing)

The entries() and values() methods still use get_keys() + get() which doesn't handle duplicate keys correctly.

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