migrate pyright to astral-sh/ty

[benedikt-bartscher]

Proposal to migrate to https://github.com/astral-sh/ty once it is ready.

blocking:

• [ty] Respect __new__ and metaclass __call__ return types astral-sh/ruff#22317
• Narrowing of constrained typevar discards constraint static type generic information astral-sh/ty#1475
• ... probably many more

current state without any changes:

0 errors, 0 warnings, 0 informations
pyright  15,40s user 0,51s system 179% cpu 8,859 total

Found 1064 diagnostics
uvx ty check  3,11s user 0,20s system 1376% cpu 0,240 total

[masenf]

yeah we like astral tooling. but could be quite a while until ty is ready