Use pyicu-wheels for tests

Consider to use https://pypi.org/project/pyicu-wheels/ (source code https://github.com/Init7/pyicu) instead of https://pypi.org/project/pyicu/ (source code https://gitlab.pyicu.org/main/pyicu), for testing purpose.

• This will allow easier test on Windows / macOS locally (currently, it is quite complicated to install pyicu on macOS as it involves compiling and link with icu4c / for Windows user, it require a download from separated source)
• Maybe quicker in CI as it doesn't require build the lib from scratch

For distribution, the declared project dependency in pyproject.toml should still stick to https://pypi.org/project/pyicu/.

Each test suite dependencies could be declared by using the PEP 735 dependency groups https://packaging.python.org/en/latest/specifications/dependency-groups/#dependency-groups. Modify pyproject.toml for that. Modify test workflow accordingly (for example, use pip install --group)

Make sure that dependency groups for test suites are covering what are actually needed by the test suites (core, compact, extra, noauto, corpus) See https://github.com/PyThaiNLP/pythainlp/blob/dev/tests/README.md

The main goal is to allow developers to install pythainlp dependency for testing purpose easily -- without the need to compile pyicu themselves.

The second goal is, once the first goal is achieved, it will simplify the CI in .github/workflows/unittest.yml