- `ByteSpanPositionProvider` provides start offset and length of CSTNode as metadata. - `get_docstring` helper provides docstring from `Module`, `ClassDef` and `FunctionDef` node types. - Optimized `ScopeProvider` performance to run faster and use less memory: - remove unnecessary `Assignment` of keyword `Arg`. - don't provide scope object for formatting information nodes. - batch set union updates in `infer_accesses` step. - Fixed `_assignments` mutation when calling read-only `Scope.get_qualified_names_for` and `__contains__`.