Add SimplifyDeep type

[sindresorhus]

#436 (comment)

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[KubaJastrz]

There is one:

type-fest/source/merge-deep.d.ts

Lines 15 to 18 in 5ad462a

	/**
	Deeply simplifies an object excluding iterables and functions. Used internally to improve the UX and accept both interfaces and type aliases as inputs.
	*/
	export type SimplifyDeep<Type> = ConditionalSimplifyDeep<Type, Function | Iterable<unknown>, object>;

Here's another:

type-fest/source/conditional-simplify.d.ts

Lines 17 to 32 in 5ad462a

	/**
	Recursively simplifies a type while including and/or excluding certain types from being simplified.
	This type is **experimental** and was introduced as a result of this {@link https://github.com/sindresorhus/type-fest/issues/436 issue}. It should be used with caution.
	See {@link ConditionalSimplify} for usages and examples.
	@internal
	@experimental
	@category Object
	*/
	export type ConditionalSimplifyDeep<Type, ExcludeType = never, IncludeType = unknown> = Type extends ExcludeType
	? Type
	: Type extends IncludeType
	? {[TypeKey in keyof Type]: ConditionalSimplifyDeep<Type[TypeKey], ExcludeType, IncludeType>}
	: Type;

None of them are exported in type-fest/index.d.ts