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hls aa1d906802 Enhance OpenCVCamera with FOURCC for MJPEG support and validation (#1558 )

* Enhance OpenCVCamera with FOURCC support and validation

- Added FOURCC configuration option to OpenCVCamera and OpenCVCameraConfig for specifying video format.
- Implemented _validate_fourcc method to validate and set the camera's FOURCC code.
- Updated _configure_capture_settings to apply FOURCC settings before FPS and resolution.
- Enhanced camera detection to include default FOURCC code in camera info.
- Updated documentation to reflect new FOURCC parameter and its implications on performance.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

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* Add tests for FOURCC configuration in OpenCVCamera

- Implemented tests to validate FOURCC configuration and its application in OpenCVCamera.
- Added checks for valid FOURCC codes and ensured that invalid codes raise appropriate errors.
- Included a test for camera connection functionality using specified FOURCC settings.

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* Fix circular import in __init__.py - change to relative import

* Update src/lerobot/cameras/opencv/configuration_opencv.py

Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>
Signed-off-by: hls <56255627+forgetwhatuwant@users.noreply.github.com>

* Update src/lerobot/cameras/opencv/configuration_opencv.py

Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>
Signed-off-by: hls <56255627+forgetwhatuwant@users.noreply.github.com>

* fix(camera_opencv): ensure MSMF hardware transform compatibility on Windows before importing OpenCV

* This change reverts the import from a relative import (.) back to the absolute import (lerobot.) as it was previously

* opencv/config: satisfy Ruff SIM102 by merging nested if for fourcc validation

* style(opencv/config): apply ruff-format changes

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Signed-off-by: hls <56255627+forgetwhatuwant@users.noreply.github.com>
Signed-off-by: Steven Palma <imstevenpmwork@ieee.org>
Co-authored-by: forgetwhatuwant <forgetwhatuwant@gmail.com>
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Steven Palma <imstevenpmwork@ieee.org>