ibus-engines.typing-booster: init at 2.1.1

This package providesa completion input method for faster typing.
See https://mike-fabian.github.io/ibus-typing-booster

Detailed instructions how to activate this IBus engine on your desktop
can be found in the upstream docs: https://mike-fabian.github.io/ibus-typing-booster/documentation.html

A simple VM with the Gnome3 desktop and activated `ibus' looks like
this:

```nix
{
  emojipicker = { pkgs, ... }: {
    services.xserver = {
      enable = true;
      desktopManager.gnome3.enable = true;
      desktopManager.xterm.enable = false;
    };
    users.extraUsers.vm = {
      password = "vm";
      isNormalUser = true;
    };
    i18n.inputMethod.ibus.engines = [
      pkgs.ibus-engines.typing-booster
    ];
    i18n.inputMethod.enabled = "ibus";
    virtualisation.memorySize = 2048;
  };
}
```

Fixes #38721

pkgs/tools/inputmethods/ibus-engines/ibus-typing-booster/default.nix

@@ -0,0 +1,41 @@
+{ stdenv, fetchFromGitHub, autoreconfHook, python3, ibus, pkgconfig, gtk3, m17n_lib
+, wrapGAppsHook, gobjectIntrospection
+}:
+
+let
+
+  python = python3.withPackages (ps: with ps; [
+    pygobject3
+    dbus-python
+  ]);
+
+in
+
+stdenv.mkDerivation rec {
+  name = "ibus-typing-booster-${version}";
+  version = "2.1.1";
+
+  src = fetchFromGitHub {
+    owner = "mike-fabian";
+    repo = "ibus-typing-booster";
+    rev = version;
+    sha256 = "01kpxplk9nh56f32fkq3nnsqykbzpi7pcxbfp38dq0prgrhw9a6b";
+  };
+
+  patches = [ ./hunspell-dirs.patch ];
+
+  nativeBuildInputs = [ autoreconfHook pkgconfig wrapGAppsHook gobjectIntrospection ];
+  buildInputs = [ python ibus gtk3 m17n_lib ];
+
+  preFixup = ''
+    gappsWrapperArgs+=(--prefix LD_LIBRARY_PATH : "${m17n_lib}/lib")
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = https://mike-fabian.github.io/ibus-typing-booster/;
+    license = licenses.gpl3Plus;
+    description = "A typing booster engine for the IBus platform";
+    maintainers = with maintainers; [ ma27 ];
+    isIbusEngine = true;
+  };
+}