Guillaume Andreu Sabater

### Description Following #877, I added a `.pre-commit-config.yaml` conf file & ran trivial lints (trailing whitespace + EOF fixers) See https://pre-commit.ci/ to automate integration. ##### The feature or problem addressed...

An argument can be made to have `pre-commit` in dev dependencies, but to me, `pre-commit` doesn't belong there either. It is its own package manager and IMO shouldn't be in...

Inconsistency between `HttpRequest` and `parse_file_upload` method introduced in 5.2.1

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# Bug report ## What's wrong #2654 removed `BytesIO` inheritance from `HttpRequest` which clashes with `parse_file_upload` signature. ```python def parse_file_upload( self, META: Mapping[str, Any], post_data: BinaryIO ) ``` A `HttpRequest`...