[vim/vim] ch_sendexpr() cannot answer a request named with a string (PR #21126)

```
Problem:  A server that names a request with a string cannot be
          answered, since ch_sendexpr() rejects an "id" that is not a
          Number.
Solution: Require a Number only when Vim has to match a reply, which
          is with ch_evalexpr() or when a callback is given.  Send the
          message as it is otherwise.
```

related: #21114
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21126

-- Commit Summary --

  * ch_sendexpr() cannot answer a request named with a string

-- File Changes --

    M runtime/doc/channel.txt (7)
    M src/channel.c (25)
    M src/testdir/test_channel.vim (15)

-- Patch Links --

https://github.com/vim/vim/pull/21126.patch
https://github.com/vim/vim/pull/21126.diff

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