reduce release sizes and speed up release time

- Uses pigz instead of gzip for faster gzipping
- Uses 7zip to create zip and 7z archives for windows (7z archive is ~49% smaller than zip archive)
- add ldflags='-s' to go build to reduce binary size by strip (reduces
  to 89MB)

upload 7zip to releases

.github/workflows/cd-release.yaml

@@ -110,6 +110,16 @@ jobs:
           asset_path: go/out/dolt-windows-amd64.zip
           asset_name: dolt-windows-amd64.zip
           asset_content_type: application/zip
+      - name: Upload Windows Distro 7z
+        id: upload-windows-distro-7z
+        uses: dolthub/upload-release-asset@v1
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: go/out/dolt-windows-amd64.7z
+          asset_name: dolt-windows-amd64.7z
+          asset_content_type: application/x-7z-compressed
       - name: Upload Install Script
         id: upload-install-script
         uses: dolthub/upload-release-asset@v1