`AsyncChunksOfCountSequence` does not create chunks of 1 element each.

[knovichikhin]

AsyncChunksOfCountSequence does not create chunks of 1 element each. Instead it creates 1 chunk of all elements.

for await chunk in ["1", "2", "3"].async.chunks(ofCount: 1) {
    print(chunk)
}

Output:

["1", "2", "3"]

Likely due to this line not checking that result.count == count:

swift-async-algorithms/Sources/AsyncAlgorithms/AsyncChunksOfCountSequence.swift

Line 55 in b339466

while let next = try await base.next() {

[FranzBusch]

This PR should fix it: #293