Enable CI/CD and standardize build system setup

[markurtz]

Specifically, it standardizes around the following pieces and is intended to be compliant with PEP 440, 517, 518, 621, and 660.

Package:

• Use pyproject.toml to follow the modern pep standards for python project packaging
• Use setup.py to augment the packaging enabling dynamic portions
• Use tox.ini to standardize everything through reproducible environments

Build:

• Ensure last release version is always represented in code (setup.py) so that builds will work absent a git repo / inside of a sdist package
• Utilize setuptools_git_versioning to enable dynamic versioning based on environment variables and git state, if available, while compiling to a static version for compatibility with wheel, sdist, and editable install flows
• Specifically, enables build types of dev=#.#.#.dev#, nightly=#.#.#.a#, candidate=#.#.#.rc#, and release=#.#.#
• Enables build iterations if a suffix is added based on an environment variable passed in, then the distance for the current commit from the last release tag, then defaults to 0
• Populates a version.txt and version.py under the root repo on build to ensure that info is properly stored and distributed
• Sources the versions to update to from tags on the repo

CI/CD:

• Enables development flows on PR creation to run standard checks for quality and tests as well as creating a dev build with the iteration set to the PR number
• Enables main branch flows on commit push to run standard checks for quality and tests
• Enables nightly flows on a cron job every 24hrs to run more substantial tests and push up a '.a' release if tests pass with the iteration number set to the number of commits since the last release tag
• Enables release candidate flows that are triggered on creation or push to a release branch to run full test sweeps and push up a '.rc' release if tests pass with the iteration number set to the number of commits since the last release tag
• Enables release flows that are triggered on the creation of a version tag that push up the release build and run a full suite of tests after to identify any potential issues post release

[github-actions]

Build artifacts (.whl and .tar.gz) are available for download for up to 30 days.
They are located at https://github.com/neuralmagic/speculators/actions/runs/14627065255/artifacts/2997041793

[github-actions]

Build artifacts (.whl and .tar.gz) are available for download for up to 30 days.
They are located at https://github.com/neuralmagic/speculators/actions/runs/14627383715/artifacts/2997171748

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/speculators/actions/runs/14649693987/artifacts/3004695181.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/speculators/actions/runs/14652589777/artifacts/3005757536.
They will be retained for up to 30 days.

[nm-red-hat-upstream-automation-bot]

📦 Build Artifacts Available
The build artifacts (.whl and .tar.gz) have been successfully generated and are available for download: https://github.com/neuralmagic/speculators/actions/runs/14738079587/artifacts/3032078594.
They will be retained for up to 30 days.