bug#60623: 30.0.50; Add forward-sentence with tree sitter support

[Eli Zaretskii]

> From: Theodor Thornhill <theo@thornhill.no>
> Cc: 60623@debbugs.gnu.org, casouri@gmail.com, eliz@gnu.org,
>  monnier@iro.umontreal.ca,Juri Linkov <juri@linkov.net>
> Date: Sun, 08 Jan 2023 14:29:08 +0100
> 
> @Eli, what doc changes do you see as needed here?

More or less.  They need some polishing, like a few words about what
does "sentence" mean in the tree-sitter context.  But we can make
these changes after this is in the repository.

Thanks.