bug#44418: 28.0.50; Spliced variable not matched as symbol in isearch

[Mattias Engdegård]

> Maybe we can introduce (@ NAME) as alternative syntax?

Here is a proof-of-concept (missing tests and documentation), but it works and 
I think it's a definite improvement.

Maybe we can get a blessing from Yuan Fu. To recap, this permits the syntax (@ 
symbol-name) as an alternative to @symbol-name in treesit queries because that 
allows symbol searching to match the symbol-name, and this can be really 
helpful.

treesit-alt-capture-construct.diff
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