chore(python): use PyClassInitializer for typed array subclasses

[dbrattli]

Summary

The fable-library-core Rust extension emitted 12 deprecation warnings when compiling against pyo3 0.29:

warning: use of deprecated method `pyo3::internal::pyclass_init::TpNewTupleResolver::<S, (S, B)>::resolve`: Tuple syntax for super class initialization is phased out. Use `PyClassInitializer` instead.

This migrates all 12 typed-array subclass constructors in src/fable-library-py/src/array.rs from the deprecated (Self, FSharpArray) tuple return to PyClassInitializer.

Before:

fn new(...) -> PyResult<(Self, FSharpArray)> {
    Ok((Int8Array {}, FSharpArray::new(py, elements, Some("Int8"))?))
}

After:

fn new(...) -> PyResult<PyClassInitializer<Self>> {
    Ok(PyClassInitializer::from(FSharpArray::new(py, elements, Some("Int8"))?).add_subclass(Int8Array {}))
}

Applied to Int8Array, UInt8Array, Int16Array, UInt16Array, Int32Array, UInt32Array, Int64Array, UInt64Array, Float32Array, Float64Array, BoolArray, and GenericArray.

Test plan

• cargo build now finishes with zero warnings (previously 12).
• PyClassInitializer was already in scope via pyo3::prelude::*; no import change needed.

🤖 Generated with Claude Code

[github-actions]

Python Type Checking Results (Pyright)

Metric	Value
Total errors	34
Files with errors	4
Excluded files	4
New errors	✅ No

Excluded files with errors (4 files)

These files have known type errors and are excluded from CI. Remove from pyrightconfig.ci.json as errors are fixed.

File	Errors	Status
temp/tests/Python/test_hash_set.py	18	Excluded
temp/tests/Python/test_applicative.py	12	Excluded
temp/tests/Python/test_nested_and_recursive_pattern.py	2	Excluded
temp/tests/Python/fable_modules/thoth_json_python/encode.py	2	Excluded