Add dynamic synced plugin config provider

[Araxeus]

There are atleast 3 open PR's which could use this: #1054 , #1065 and #1079

Synced PluginConfig

This PR allows all plugin to easily have access to synced config on both main & renderer (back/front)

This is potentialy very useful, after all plugins implement this class - most plugin options shouldn't require a restart to apply

---

Example

in ./plugins/my-plugin/config.js:

 const { PluginConfig } = require("../../config/dynamic");
 const config = new PluginConfig("plugin-name", { enableFront: true });
 module.exports = { ...config };

---

in ./plugins/my-plugin/back.js:

const config = require("./config");

config.set("myOption", true)

assert.equal(config.get("myOption"), true);

---

in ./plugins/my-plugin/front.js:

const config = require("./config");

await config.set("myOption", true)

assert.equal(
  await config.get("myOption"),
  true,
);

Example 2

The config could also be initialized straight from back.js (tho I doubt there's ever a reason to do that)

 module.exports = (win, options) => {
  const config = new PluginConfig("plugin-name", {
  	enableFront: true,
  	initialOptions: options,
  });
  setupMyPlugin(win, config);
 };

TODO

• a6242d1 adds support for getActivePlugins and isActive. need to implement in plugins where we want it instead of isEnabled
  Find use cases here: https://github.com/search?q=repo%3Ath-ch%2Fyoutube-music+enabled+path%3Aplugins&type=code