feat: 支持配置画布背景颜色和图片

[promise6512]

• 支持配置背景颜色
• 支持配置背景图片

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: 9cc223b25a7b4677196576e05d412aa5a9e8c75e

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[lgtm-com[bot]]

This pull request introduces 1 alert when merging 0a162096675df623188517666d595f300d9dc56f into 6737c053516119e73e26551600783d3007daab33 - view on LGTM.com

new alerts:

• 1 for Unused variable, import, function or class