Support linking with pyo3 in abi3 debug mode on Windows

[messense]

when testing this, I found that maturin produced abi3 builds using .pyd suffix, even if ext_suffix in PYO3_CONFIG_FILE was set to something else. It looks like these debug builds only import abi as _d.pyd or version-specific as e.g. _d.cp312-win_amd64.pyd. Might need to adjust maturin a little?

Originally posted by @davidhewitt in PyO3/pyo3#2937 (comment)

[messense]

abi3 so name is currently hard-coded.

maturin/src/module_writer.rs

Lines 720 to 731 in 4291042

	let so_filename = match python_interpreter {
	Some(python_interpreter) => python_interpreter.get_library_name(ext_name),
	// abi3
	None => {
	if target.is_unix() {
	format!("{ext_name}.abi3.so")
	} else {
	// Apparently there is no tag for abi3 on windows
	format!("{ext_name}.pyd")
	}
	}
	};