[Feature] Support js-based configs

[CreativeTechGuy]

Now that the cspell CLI can handle a config file like cspell.config.mjs, it'd be great if the VS Code Plugin would be able to read/write to this file also (in all the same ways as it could with the cspell.json version). Ideally it'd support all of the different configuration file types.

It seems like currently:

• CJS configs can be read but fail to write to
• MJS configs fail to both read and write