[FEATURE] Storage Limitation

[Nexisato]

Just suggestions :)

👍 What problem does this feature solve

At present, swanlab cached the media static files per specific step. For users running train tasks on theri own devices, these cached files might occupy hugh amount of disk usage.

Is that possible for us to instroduce a strategy to limit the cached files capcacity?

(Maybe only useful for online version in the future)

[SAKURA-CAT]

在未来云版本中，所有媒体资源会上传云端，在本地可以选择保存原始媒体文件还是资源链接（字符串），这样能够有效减小包大小——但是会带来副作用：必须联网才能查看媒体资源