Add verbosity option to install tool command.

This commit adds the `--verbosity` option to the `install tool` command.

MSBuild/NuGet output is now controllable by the user and defaults to being "quiet".

This enables users to see warnings from NuGet that otherwise would be swallowed
unless NuGet returned a non-zero exit code. As a byproduct of this change, the
exception handling and error messages related to obtaining tool packages was
retooled. We no longer display `install tool` command line help for installation
failures, as it should only be displayed for command line syntax errors.

Fixes #8465.

test/Microsoft.DotNet.Tools.Tests.Utilities/BufferedReporter.cs

@@ -0,0 +1,26 @@
+using System;
+using System.Collections.Generic;
+using Microsoft.DotNet.Cli.Utils;
+
+namespace Microsoft.DotNet.Tools.Test.Utilities
+{
+    public class BufferedReporter : IReporter
+    {
+        public List<string> Lines { get; private set; } = new List<string>();
+
+        public void WriteLine(string message)
+        {
+            Lines.Add(message);
+        }
+
+        public void WriteLine()
+        {
+            Lines.Add("");
+        }
+
+        public void Write(string message)
+        {
+            throw new NotImplementedException();
+        }
+    }
+}