refactor(value): migrate Value::Array to Array storage abstraction

[anakrish]

Summary

• Swap Value::Array payload storage from Vec to value::Array while preserving Vec conversion compatibility.
• Update as_array/as_array_mut to expose Array and delegate Value construction through Array::into_value.
• Serialize RVM binary array payloads via Array-aware references and deserialize into Array.
• Rewrite IterationState::Array around ArrayCursor; setup_next_iteration now self-advances and advance() is a no-op.
• Migrate array builtins, interpreter/RVM sites, metadata, Azure helpers, schema/value tests, and the WASM binding test to the Array API.

Judgment calls

• Kept Value::from(Vec) and made the internal from_array helper generic for compatibility while storing Array internally.
• Added no new foundation methods; used existing Array APIs/as_slice where needed.

Validation

• cargo +1.92.0 xtask fmt
• cargo +1.92.0 xtask clippy
• cargo +1.92.0 test --lib --all-features
• cargo +1.92.0 test --doc --all-features
• cargo +1.92.0 test --all-features