Add managed codec DSP and initial control server

dotnet/compare-dsp-fixtures.ps1

@@ -0,0 +1,13 @@
+param(
+    [Parameter(Mandatory)][string]$ExpectedPath,
+    [Parameter(Mandatory)][string]$ActualPath
+)
+
+$ErrorActionPreference = 'Stop'
+$expected = (Get-Content -Raw -LiteralPath $ExpectedPath | ConvertFrom-Json).samples
+$actual = (Get-Content -Raw -LiteralPath $ActualPath | ConvertFrom-Json).samples
+if ($expected.Count -ne 960 -or $actual.Count -ne $expected.Count) { throw 'DSP fixture sample counts differ.' }
+for ($i = 0; $i -lt $expected.Count; $i++) {
+    if ([Math]::Abs($expected[$i] - $actual[$i]) -gt 1) { throw "DSP fixture differs at sample $i." }
+}
+Write-Output 'C++ DSP fixture matches within one PCM unit.'