Fix pyproject.toml for wheel generation

The packages list was missing the new module introduced in !37 (merged) [c3815303]. The MR adds hog.operator_generation.function_space_implementations to the list. This is a recurring problem, see also !22 (merged) in this respect.

added bugfix user experience labels

requested review from @he66coqe

mentioned in issue #50

approved this merge request

merged

mentioned in commit 480cb0b5