apollo-env polyfill fromentries does not match Typescript ES2019

Hi!

Currently, `Object.fromentries` in the `apollo-env` polyfill is declared as:
```typescript
fromEntries(map: [K, V][]): Record;
```
While the Typescript official method is:
```typescript
fromEntries(entries: Iterable): { [k: string]: T };
```

Since `apollo-env` is declared globally, it will overwrite the official method. And the official typing is nicer to work with.
Would it be possible to align the typing with the official one and/or remove it since it is now part of >ES2019.

Thanks!

Search the repository for the apollo-env Object.fromEntries declaration shown in the issue and compare it with the TypeScript ES2019 signature quoted there. Verify the updated or removed declaration with the project's existing TypeScript checks; done means the global polyfill no longer overrides the official typing.

Written by the indexing model from the issue text.