Support regular expressions for library options

[ecraig12345]

Support passing regular expressions for inlinedLibraries, importedLibraries, and allowedTypesLibraries. This is to support scenarios like easily inlining all packages from the current repo's scope or certain dependency scopes: e.g. inlinedLibraries: [/^@scope\//].

While updating the config schema validation, I noticed that the SchemaDescriptor type was not properly validating types of sub-properties that weren't objects or arrays. So I updated it to use a series of conditional checks to handle all the expected values, and added error messages for a couple of cases that were previously missing.

I also fixed some type errors unrelated to my change which appear to be caused by typescript updates: certain APIs now return ts.ModuleExportName (ts.Identifier | ts.StringLiteral) instead of ts.Identifier.