IfType type guards

[ZachHaber]

The readme mentions that there should be a corresponding IfType guard for every IsType check.

For every IsT type (e.g. IsAny), there is an associated IfT type that can help simplify conditional types.

I'm only seeing a few IfType guards in the package (IfNever, IfAny, and IfUnknown).

Potential fixes (that I can think of at the moment):

1. Add the missing IfType guards
2. Update the readme to specifically call out those three guards

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[sindresorhus]

PR welcome for types starting with Is that are missing an If type.