添加GDAL后端并支持LEVIR-CD数据集

[OpenMMLab-Assistant-004]

添加GDAL后端并支持LEVIR-CD数据集

MMSeg中支持单张和多张多通道遥感影像的加载，并支持变化检测任务

Task Information

Repository：MMSegmentation

Difficulty：Medium

Points：40

Estimated Time Consumption：21 days

Task Status

Claimant's Github ID：Zoulinx

Claim Time：2023年06月01日

PR Link：open-mmlab/mmsegmentation#2903

Points to Note

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After completing the task, please submit a PR with the title starting with [MMSIG]. After submission, please reply with your PR link in the comments section of this Discussion. We will review your work as soon as possible.

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