Source options for the plugin list

Use case or problem

Plugin market is not available in some places of Mainland China. Using a proxy plugin can solve the problem.

Proposed solution

Add an option to select sources of the plugin list.

Current workaround (optional)

Windows 11 Pro, Obsidian 1.1.9, campus network of Xidian University (but the issue also occurs with China Mobile’s network in Jiangxi Province)