add Rust gnu 1.44.0 (latest version) (#1803)

* add rust-gnu-1.44.0

* change yaml file to UTF-8

manifests/Rustlang/rust-gnu/1.44.0.yaml

@@ -0,0 +1,18 @@
+Id: Rustlang.rust-gnu
+Version: 1.44.0
+Name: rust-gnu
+Publisher: Rustlang
+License: Apache 2.0 and MIT
+LicenseUrl: https://raw.githubusercontent.com/rust-lang/rust/master/COPYRIGHT
+AppMoniker: rust-gnu
+Tags: rust, windows, gnu
+Description: this is the rust-lang built with gnu toolchain
+Homepage: https://www.rust-lang.org/
+Installers:
+  - Arch: x64
+    Url: https://static.rust-lang.org/dist/rust-1.44.0-x86_64-pc-windows-gnu.msi
+    Sha256: 7E2FCF0EA05A3814C6EA10B416E7347113EC6A31701E4A0D4A701020591E91AE
+    InstallerType: msi
+    Switches:
+      Silent: "/quiet"
+      SilentWithProgress: "/quiet /passive"