feature: Support new `lazy` soft keyword

[StanFromIreland]

Did you check the tree-sitter docs?

• I have read all the tree-sitter docs if it relates to using the parser

Is your feature request related to a problem? Please describe.

See the Python documentation for more information about the lazy soft keyword, it was added in Python 3.15 (PEP 810).

Describe the solution you'd like

I'd like lazy to be highlighted, similarly to other soft keywords like match.

Describe alternatives you've considered

N/A

Additional context

No response

[tausbn]

In case it is useful, here's how we added this to the CodeQL Python parser: PEP-810 (grammar.js change is at the bottom).
Also, we added support for unpacking inside comprehensions here: PEP-798.