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Taus 48cd54165a Python: Support template strings in rest of extractor

Adds three new AST nodes to the mix:

- `TemplateString` represents a t-string in Python 3.14
- `TemplateStringPart` represents one of the string constituents of a
t-string. (The interpolated expressions are represented as `Expr` nodes,
just like f-strings.)
- `JoinedTemplateString` represents an implicit concatenation of
template strings.

Importantly, we _completely avoid_ the complicated construction we
currently do for format strings (as well as the confusing nomenclature).
No extra injection of empty strings (so that a template string is a
strict alternation of strings and expressions). A `JoinedTemplateString`
simply has a list of template string children, and a `TemplateString`
has a list of "values" which may be either `Expr` or
`TemplateStringPart` nodes.

If we ever find that we actually want the more complicated interface for
these strings, then I would much rather we reconstruct this inside of QL
rather than in the parser.

2025-12-04 16:42:43 +00:00