Ghreq

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- When a 403 response is received with a `Retry-After` or `x-ratelimit-reset`
header that would result in the next retry attempt being after `total_wait`
is exceeded, don't retry.

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- Migrated from setuptools to hatch
- Added a `set_headers` argument to the `Client` constructor for explicitly
setting or not setting headers on sessions
- Added `timeout` arguments to the request methods
- Added `allow_redirects` argument to `Client.request()` and
`Endpoint.request()`

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- Adjusted the type hints on `PrettyHTTPError` to indicate that the `response`
attribute is always non-`None`

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- A session-wide `Accept` header can now be specified when constructing a
`Client` without having to use a custom `Session`
- Added a `headers` argument to the `Client` constructor for setting arbitrary
additional headers without having to use a custom `Session`
- Gave `Client` a `close()` method

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- The `version` argument to `make_user_agent()` is now optional
- The `url` argument to `make_user_agent()` is now actually optional

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- Fix the type annotation on `Client.__enter__` to support subclassing