Remove hand-written `init?(fromLSPDictionary:)` / `encodeToLSPAny()`
from LSPAnyCodable types, relying instead on the default implementations
backed by `LSPAnyEncoder`/`LSPAnyDecoder`
For now, this is only the action to add thousands separators to integer literals but hopefully this list will grow as we translate more refactoring actions to swift-syntax.