Sequence extension with `sorted(by:)` function should be internal

[qizh]

instantsearch-ios/Sources/InstantSearchCore/Extensions/Sequence+Convenience.swift

Lines 10 to 11 in 09c9fa3

	public extension Sequence {
	func sorted<T: Comparable>(by keyPath: KeyPath<Element, T>) -> [Element] {

So it won't pollute code suggestions for projects using this library.
Also many libraries or projects have similar function implemented, usually with the same definition.

In some cases it can even produce a warning in Xcode 14.
When function with the same name is used in inlinable code when InstantSearchCore is added to the project but is not imported in this specific file.

[qizh]

Still the case in Xcode 15