[vim/vim] :set completion works for an invalid sub-option name (PR #20893)

```
Problem:  Completing the value after a sub-option name also works when the
          name merely ends in a valid one, e.g. "invalid_close:".
Solution: Require the name to start the option value or to follow a comma.
          Compute the length of the name at compile time.
```

related: #20676
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/20893

-- Commit Summary --

  * :set completion works for an invalid sub-option name

-- File Changes --

    M src/optionstr.c (24)
    M src/testdir/test_options.vim (8)

-- Patch Links --

https://github.com/vim/vim/pull/20893.patch
https://github.com/vim/vim/pull/20893.diff

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