feat: add allow_override parameter to registration methods

[yasuhito]

✍ Description

This PR adds the allow_override parameter to all registration methods in the Tranqu class to provide consistent control over registration overrides. The following methods have been updated:

• register_program_converter
• register_device_converter
• register_program_type
• register_device_type

Each method now accepts an optional allow_override parameter (defaults to False) that controls whether existing registrations can be overwritten.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Files with missing lines	Coverage Δ
src/tranqu/device_converter/__init__.py	100.00% <ø> (ø)
...ranqu/device_converter/device_converter_manager.py	100.00% <100.00%> (+14.81%)	⬆️
src/tranqu/device_type_manager.py	100.00% <100.00%> (ø)
...nqu/program_converter/program_converter_manager.py	100.00% <100.00%> (ø)
src/tranqu/program_type_manager.py	100.00% <100.00%> (ø)
src/tranqu/tranqu.py	98.21% <100.00%> (ø)
src/tranqu/transpiler/transpiler_manager.py	100.00% <100.00%> (ø)

[snuffkin]

LGTM!