Revert "fix: Remove Thumbnailer dependency (#294)"

[pengfeixx]

This reverts commit 0b8cd83.

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 在imageitem.cpp文件中，异常捕获块中的代码被重复使用了，应该将其提取到一个单独的函数中以提高代码的可读性和可维护性。
• malloc_trim(0);在每次调用generateThumbnail时都被调用，这可能是不必要的，应该确认其必要性。
• getLoadLibsInstance()->m_video_thumbnailer();在每次调用generateThumbnail时都被调用，这可能是不必要的，应该确认其必要性。
• getLoadLibsInstance()->m_video_thumbnailer_create_image_data();在每次调用generateThumbnail时都被调用，这可能是不必要的，应该确认其必要性。
• getLoadLibsInstance()->m_video_thumbnailer_destroy_image_data(m_image_data);在每次调用generateThumbnail后都被调用，这可能是不必要的，应该确认其必要性。
• getLoadLibsInstance()->m_video_thumbnailer_destroy(m_video_thumbnailer);在每次调用generateThumbnail后都被调用，这可能是不必要的，应该确认其必要性。

是否建议立即修改:
是

[deepin-ci-robot]

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This pull-request has been approved by: lzwind, pengfeixx

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