Strawberry-graphql

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Rename `Extension` to `SchemaExtension` to pave the way for FieldExtensions.
Importing `Extension` from `strawberry.extensions` will now raise a deprecation
warning.

Before:

python
from strawberry.extensions import Extension


After:

python
from strawberry.extensions import SchemaExtension


Contributed by [Jonathan Kim](https://github.com/jkimbo) via [PR #2574](https://github.com/strawberry-graphql/strawberry/pull/2574/)

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This release changes how extension hooks are defined. The new style hooks are
more flexible and allow to run code before and after the execution.

The old style hooks are still supported but will be removed in future releases.

**Before:**

python
def on_executing_start(self): Called before the execution start
...


def on_executing_end(self): Called after the execution ends
...


**After**

python
def on_execute(self):
This part is called before the execution start
yield
This part is called after the execution ends


Contributed by [ניר](https://github.com/nrbnlulu) via [PR #2428](https://github.com/strawberry-graphql/strawberry/pull/2428/)

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Add a type annotation to `strawberry.fastapi.BaseContext`'s `__init__` method so that
it can be used without `mypy` raising an error.

Contributed by [Martin Winkel](https://github.com/SaturnFromTitan) via [PR #2581](https://github.com/strawberry-graphql/strawberry/pull/2581/)

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Throw proper exceptions when Unions are created with invalid types

Previously, using Lazy types inside of Unions would raise unexpected, unhelpful errors.

Contributed by [ignormies](https://github.com/BryceBeagle) via [PR #2540](https://github.com/strawberry-graphql/strawberry/pull/2540/)