Vet v6.0.0-alpha.5 types emitted types against v5.5.3

[damienwebdev]

We need to ensure that the types emitted from our packages are API compatible with the previous DefinitelyTyped package.

See:

1. types: random.arrayElement (and probably others) should support ReadonlyArray #166
2. Accept dates as params for Date methods #198
3. faker.address.nearbyGPSCoordinate (coordinate is a ReadOnlyArray in DefinitelyTyped)
4. faker.address.companyName has an arg of format which should be string | number
5. faker.database.column is implicitly return typed as string in 6.0.0-alpha.5 but should be set to return string
6. faker.database.type() is implicitly return typed as string in 6.0.0-alpha.5 but should be set to return string
7. faker.database.collation() is implicitly return typed as string in 6.0.0-alpha.5 but should be set to return string
8. faker.database.engine() is implicitly return typed as string in 6.0.0-alpha.5 but should be set to return string
9. faker.finance.currencyCode() is return typed any
10. faker.finance.currencyName() is return typed any
11. faker.finance.currencySymbol() is return typed any
12. faker.hacker.abbreviation() is implicitly return typed as string
13. faker.hacker.adjective() is implicitly return typed as string
14. faker.hacker.noun() is implicitly return typed as string
15. faker.hacker.verb() is implicitly return typed as string
16. faker.hacker.ingverb() is implicitly return typed as string
17. faker.hacker.phrase() is implicitly return typed as string

I'm sure there are a few others, but we need to check type by type to ensure spec compatibility.

[Shinigami92]

It could help to look what the types were their, but keep in mind that also these could be out of sync from the source code and introduce false assumptions.
Don't just trust these blindly.

The Date type issue explicitly showed how wrong type assumption can nearly introduce new bugs to us without covered by the tests 😬

We are still in alpha and on some places I even did not assign a type yet, to explicitly find out what the real type is.

[Shinigami92]

Here is a version of the types: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/291c346588768b8ea13472ff95bdacd659f67790/types/faker/index.d.ts

Note that there are also some interfaces like https://github.com/DefinitelyTyped/DefinitelyTyped/blob/291c346588768b8ea13472ff95bdacd659f67790/types/faker/index.d.ts#L336

These could be helpful for https://github.com/faker-js/faker/pull/151/files#diff-a2a171449d862fe29692ce031981047d7ab755ae7f84c707aef80701b3ea0c80R202, but I think I will split this PR into multiple smaller once anyway

[ST-DDT]

Is there a tool to automatically compare the types?

[import-brain]

Reopened due to my PR not fixing every single type listed here

[Shinigami92]

@damienwebdev Would you like to update the description of this issue and notify me/us about what is still missing?