ZipLongest: IList<> implementation

[viceroypenguin]

This PR adds an IList<> implementation for ZipLongest, which improves memory usage and performance.

Fixes #411

// * Summary *

BenchmarkDotNet=v0.13.5, OS=Windows 11 (10.0.22621.1555/22H2/2022Update/SunValley2)
12th Gen Intel Core i7-12700H, 1 CPU, 20 logical and 14 physical cores
.NET SDK=8.0.100-preview.3.23178.7
  [Host] : .NET 7.0.5 (7.0.523.17405), X64 RyuJIT AVX2

Method	source1	source2	N	Mean	Error	StdDev	Gen0	Gen1	Allocated
ZipLongestCount	Syste(...)nt32] [47]	Syste(...)nt32] [47]	10000	15.97 ns	0.157 ns	0.131 ns	0.0032	0.0000	40 B
ZipLongestCount	Syste(...)nt32] [62]	Syste(...)nt32] [62]	10000	159,520.55 ns	667.403 ns	591.635 ns	-	-	296 B
ZipLongestCopyTo	Syste(...)nt32] [47]	Syste(...)nt32] [47]	10000	109,703.55 ns	577.051 ns	511.541 ns	6.3477	1.0986	80112 B
ZipLongestCopyTo	Syste(...)nt32] [62]	Syste(...)nt32] [62]	10000	187,554.54 ns	1,372.398 ns	1,283.742 ns	16.8457	2.9297	212032 B
ZipLongestElementAt	Syste(...)nt32] [47]	Syste(...)nt32] [47]	10000	26.30 ns	0.223 ns	0.197 ns	0.0032	0.0000	40 B
ZipLongestElementAt	Syste(...)nt32] [62]	Syste(...)nt32] [62]	10000	130,856.39 ns	813.885 ns	721.488 ns	-	-	296 B

Code

#load "BenchmarkDotNet"

void Main()
{
	RunBenchmark();
}

public IEnumerable<object[]> EnumerableArguments()
{
	foreach (var i in new[] { 10_000, })
	{
		yield return new object[]
		{
			Enumerable.Range(1, i).Where(_ => true),
			Enumerable.Range(1, i / 2).Where(_ => true),
			i,
		};
		yield return new object[]
		{
			Enumerable.Range(1, i).ToList(),
			Enumerable.Range(1, i / 2).ToList(),
			i,
		};
	}
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void ZipLongestCount(IEnumerable<int> source1, IEnumerable<int> source2, int N)
{
	_ = source1.ZipLongest(source2).Count();
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void ZipLongestCopyTo(IEnumerable<int> source1, IEnumerable<int> source2, int N)
{
	_ = source1.ZipLongest(source2).ToArray();
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void ZipLongestElementAt(IEnumerable<int> source1, IEnumerable<int> source2, int N)
{
	_ = source1.ZipLongest(source2).ElementAt(8_000);
}

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.05 🎉

Comparison is base (0340757) 87.83% compared to head (cddcb81) 87.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #413      +/-   ##
==========================================
+ Coverage   87.83%   87.88%   +0.05%     
==========================================
  Files         239      239              
  Lines        7404     7452      +48     
  Branches     1707     1719      +12     
==========================================
+ Hits         6503     6549      +46     
- Misses        461      463       +2     
  Partials      440      440              

Impacted Files	Coverage Δ
...ator/SuperLinq.Generator.Generator/ZipLongest.g.cs	100.00% <100.00%> (ø)
Source/SuperLinq/SuperEnumerable.cs	81.81% <100.00%> (+6.81%)	⬆️

... and 1 file with indirect coverage changes

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