attempt to fix performance issues with a cache

Author: arturcic

src/GitVersion.LibGit2Sharp/Git/CommitCollection.cs

@@ -6,11 +6,16 @@ namespace GitVersion.Git;
 internal sealed class CommitCollection : ICommitCollection
 {
     private readonly ICommitLog innerCollection;
+    private readonly Lazy<IReadOnlyCollection<ICommit>> commits;
 
-    internal CommitCollection(ICommitLog collection) => this.innerCollection = collection.NotNull();
+    internal CommitCollection(ICommitLog collection)
+    {
+        this.innerCollection = collection.NotNull();
+        this.commits = new Lazy<IReadOnlyCollection<ICommit>>(() => this.innerCollection.Select(commit => new Commit(commit)).ToArray());
+    }
 
     public IEnumerator<ICommit> GetEnumerator()
-        => this.innerCollection.Select(commit => new Commit(commit)).GetEnumerator();
+        => this.commits.Value.GetEnumerator();
 
     IEnumerator IEnumerable.GetEnumerator() => GetEnumerator();