formatArgumentValidationError doesn't align to apollo formatError

[galkin]

Describe the bug
formatArgumentValidationError doesn't align to apollo formatError

To Reproduce

1. Install the lastest dependencies versions:

npm install apollo-server-core type-graphql typescript
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2. Create file index.ts with such content

import { Config } from 'apollo-server-core';
import { formatArgumentValidationError } from 'type-graphql';

const options: Config = {
  formatError: formatArgumentValidationError
};

3. Run compiling

tsc index.ts
index.ts:5:3 - error TS2322: Type '(err: GraphQLError) => { [key: string]: any; }' is not assignable to type '(error: GraphQLError) => GraphQLFormattedError'.
  Type '{ [key: string]: any; }' is missing the following properties from type 'GraphQLFormattedError': message, locations, path

5   formatError: formatArgumentValidationError
    ~~~~~~~~~~~

  node_modules/apollo-server-core/dist/graphqlOptions.d.ts:10:5
    10     formatError?: (error: GraphQLError) => GraphQLFormattedError;
           ~~~~~~~~~~~
    The expected type comes from property 'formatError' which is declared here on type 'Config'


Found 1 error.

Expected behavior
Code compiled without errors

Enviorment (please complete the following information):

• OS: Mac
• Node v10.15.1
• Package version 0.16.0
• TypeScript version 3.3.3333

[MichalLytek]

Duplicate of #258 🔒