Remove extraneous artifacts from `.whl`; add build scripts to `.tar.gz.`

• Remove extraneous artifacts from the built romt-x.y.z-*.whl file. In the absence of a specified format option, these should have been present only in the source distribution file romt-x.y.z.tar.gz according to the Poetry documentation (https://python-poetry.org/docs/pyproject/#include-and-exclude). Now explicitly restrict these included files using format = "sdist". In addition, include make-exec-* and romt-wrapper.py into the source distribution file to allow building the romt executable.