Packaging environment using pyproject.toml; change configuration of pre-commit hooks; use __version__ for project build version.

[gmkll]

• Provide simple build environment with setuptools using pyproject.toml
• Add infos about packaging in README.md
• Provide a project version reference __version__in handler, currently set to 1.0.0
• Comment debugging statements and add warning for duplicate size in search request
• Change in pre-commit-config check hook to pre-stages and update versions of pre-commit-hooks and pre_commit.