chore: bump version to 0.4.0 + changelog CMakeLists 0.3.2 -> 0.4.0; add metainfo release entries for 0.3.3, 0.3.4 (backfilled from main) and 0.4.0.
chore: bump version to 0.4.0 + changelog CMakeLists 0.3.2 -> 0.4.0; add metainfo release entries for 0.3.3, 0.3.4 (backfilled from main) and 0.4.0.