Typescript Improvements and esModuleInterop fix

[evans]

This removes exModuleInterop, which was breaking some builds with TS #1182

Additionally adds in support for strings passed directly to gql and adds the documentation requested by #1194. For example:

const typeDefinitions = readFileSync(join(__dirname, "../../schema.graphql"), "utf8");

export default gql`
  ${typeDefinitions}
`;

//vs 

const typeDefinitions = gql(readFileSync(join(__dirname, "../../schema.graphql"), "utf8"));


// app file
const apolloServer = new ApolloServer({ typeDefs, resolvers });