Plugins should specify how to update

[dsherret]

Right now only some plugins can update when running dprint config update by looking at https://plugins.dprint.dev/info.json — however, this is not ideal because it uses a centralized file. Instead probably each plugin should specify a url that provides the information about what the latest plugin url is. This would link to a url similar to info.json, but it would be only for the current plugin.

[dsherret]

There is now a latest.json endpoint for the plugins on plugins.dprint.dev. For example:

• https://plugins.dprint.dev/dprint/dprint-plugin-json/latest.json
• https://plugins.dprint.dev/malobre/dprint-plugin-vue/latest.json

These could be specified in an "updateUrl" on the plugin's PluginInfo.