[vim/vim] buffered listener cannot obtain the text of a change (PR #21071)

```
Problem:  A callback added with listener_add() is given the line numbers of
          a change but not the text.  When changes are buffered, two changes
          to the same line do not change the line count and are reported
          together, so getbufline() can only return the result of the second
          one.
Solution: Let listener_add() take a Dictionary of options and add a "text"
          option, which stores the resulting text in each item of the list
          of changes.  The text is copied when the change is recorded, so it
          is not affected by later changes.  Invoke the callback early when
          a lot of text has been recorded, to bound the memory used.
```

related: #19621

The API sketched in that discussion has each change entry carry the text from
before and after the change.  Only the text after the change is included here.
The old lines are already gone by the time a change is recorded, so keeping
them needs a separate hook in ml_delete().  An LSP client does not need them:
a textDocument/didChange notification is built from the range in the old
document and the new text, both of which an entry already has.
You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21071

-- Commit Summary --

  * buffered listener cannot obtain the text of a change

-- File Changes --

    M runtime/doc/builtin.txt (47)
    M src/change.c (81)
    M src/evalfunc.c (19)
    M src/proto/typval.pro (1)
    M src/structs.h (2)
    M src/testdir/test_listener.vim (147)
    M src/testdir/test_vim9_builtin.vim (1)
    M src/typval.c (12)

-- Patch Links --

https://github.com/vim/vim/pull/21071.patch
https://github.com/vim/vim/pull/21071.diff

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