bug#60654: 30.0.50; tree-sitter: `transpose-sexps-function' uses a lambda in a defvar

[Mickey Petersen]

The defvar `transpose-sexps-function' holds on to a lambda function. Would it 
be possible to make it an actual function? Its purpose is rather important as 
it is the default transposition function that was moved out of 
`transpose-sexps'. Being able to reliably access it when 
`transpose-sexps-function' is overriden is useful.


In GNU Emacs 30.0.50 (build 6, x86_64-pc-linux-gnu, GTK+ Version
 3.24.20, cairo version 1.16.0) of 2023-01-02 built on mickey-work
Repository revision: c209802f7b3721a1b95113290934a23fee88f678
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12013000
System Description: Ubuntu 20.04.3 LTS

Configured using:
 'configure --with-native-compilation --with-json --with-mailutils
 --without-compress-install --with-imagemagick CC=gcc-10'