chore: migrate setup.py to a pyproject.toml

[florianvazelle]

Description

Several CVEs in dependencies are reported by Dependabot. I get the impression that the current workflow does not allow Dependabot to bump dependencies correctly.

A good practice would be to pin dependencies, at least to have reproducible CI.
I therefore propose switching to a tool such as Poetry or UV, that this also improve dependencies management.

But first we need to migrate setup files to pyproject.toml.

Commands

For build, the command:

python setup.py sdist bdist_wheel

was moved to

pip install build
pyproject-build

For test, the command:

python setup.py test

was moved to

pip install .[tests]
python test_opensearchpy/run_tests.py

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