Sync alphametics

[mk-mxp]

• Run bin/configlet sync -u -e alphametics --yes --docs --filepaths --metadata --tests include (updates the Markdown files and maybe tests.toml)
• Drop strict types comments from test file and example code (these are useless)
• Add and sync test meta data to tests (uuid / @testdox in DocBlocks)
• Decide on adding / adjusting / ordering test cases to match current problem specs
  • alphametics: missing 10 test cases
  • Take special care for run time issues! This exercise was hit by the 20 seconds limit of the online test runner in the past

Do not redesign the student's interface or add test cases that would invalidate existing community solutions. These are extra tasks, which should be discussed in advance.