Use different embedded bundle loaders for lint vs LSP

[anderseknert]

We currently use the same bundle loader for both regal lint and the language server. This is convenient, but it also means that all the files related to only the language server must be parsed when regal lint is invoked, even though those files are never to be used in that path.

Since the LSP policies will only grow in time, we should use separate bundle loading for regal lint and the language server.