Introduce new macro combine-change-calls

This macro is a bit like combine-after-change-calls, but also works with a
non-null before-change-functions.  It suppresses the operation of the change
hooks on a possibly large sequence of buffer modifications, replacing them
with a single invocation of before-change-functions at the start, and a single
invocation of after-change-functions at the end.

* lisp/subr.el (undo--combining-change-calls): New variable.
(combine-change-calls-1, undo--wrap-and-run-primitive-undo): New functions.
(combine-change-calls): New macro.

* doc/lispref/text.texi (Change Hooks): Document combine-change-calls.

* etc/NEWS: Add an entry under "Lisp Changes" for combine-change-calls.

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