add enforce.allOf compound for AND style requirements

[ealush]

Similar to anyOf, we need an AND relationship rule: allOf.

In the following example value must both be a string and longer than 10.

enforce(value).allOf(
  enforce.longerThan(10),
  enforce.isString,
);

This can be even more useful when combined with templates and shape validations:

const User = enforce.template(
  enforce.loose({
    id: enforce.isNumber()
    name: enforce.shape({
      first: enforce.isString(),
      last: enforce.isString(),
      middle: enforce.optional(enforce.isString()),
    }),
  })
);

const DisabledAccount = enforce.template(
  enforce.loose({
    disabled: enforce.equals(true)
  })
)

enforce(value).allOf(
  User,
  DisabledAccount
);

Developer guidelines

1. Create a new file called allOf right next to anyOf. It should be pretty much the same, implementing the rules.some logic with some other counter mechanism.

2. To actually have it used by enforce, add it to this compounds export

3. Add a new test file here and test different scenarios

4. Add suitable types here and here (basically duplicate anyOf).

5. If you feel like it, also add suitable docs for this feature here