Lead: IList<> implementation

[viceroypenguin]

This PR adds an IList<> implementation of Lead, which reduces memory usage and improves performance.

Fixes #405

// * 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	source	N	Mean	Error	StdDev	Gen0	Gen1	Allocated
LeadCount	Syste(...)nt32] [47]	10000	11.11 ns	0.101 ns	0.090 ns	0.0032	0.0000	40 B
LeadCount	Syste(...)nt32] [62]	10000	130,990.59 ns	679.288 ns	635.406 ns	-	-	464 B
LeadCopyTo	Syste(...)nt32] [47]	10000	82,063.31 ns	416.850 ns	389.922 ns	6.3477	1.0986	80120 B
LeadCopyTo	Syste(...)nt32] [62]	10000	150,546.04 ns	845.796 ns	791.158 ns	16.8457	2.9297	212200 B
LeadElementAt	Syste(...)nt32] [47]	10000	18.10 ns	0.381 ns	0.509 ns	0.0032	0.0000	40 B
LeadElementAt	Syste(...)nt32] [62]	10000	101,688.96 ns	928.388 ns	822.991 ns	-	-	464 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),
			i,
		};
		yield return new object[]
		{
			Enumerable.Range(1, i).ToList(),
			i,
		};
	}
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void LeadCount(IEnumerable<int> source, int N)
{
	_ = source.Lead(50).Count();
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void LeadCopyTo(IEnumerable<int> source, int N)
{
	_ = source.Lead(50).ToArray();
}

[Benchmark]
[ArgumentsSource(nameof(EnumerableArguments))]
public void LeadElementAt(IEnumerable<int> source, int N)
{
	_ = source.Lead(50).ElementAt(8_000);
}

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01 🎉

Comparison is base (a820ef0) 87.74% compared to head (de60975) 87.76%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
+ Coverage   87.74%   87.76%   +0.01%     
==========================================
  Files         239      239              
  Lines        7370     7386      +16     
  Branches     1702     1703       +1     
==========================================
+ Hits         6467     6482      +15     
- Misses        463      464       +1     
  Partials      440      440              

Impacted Files	Coverage Δ
Source/SuperLinq/Lead.cs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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