feat(gen-edgehog-jwt): make dependencies explicit

add a `requirements.txt` file with the two required dependencies

Signed-off-by: Francesco Noacco <francesco.noacco@secomind.com>

tools/requirements.txt

@@ -0,0 +1,22 @@
+#
+# This file is part of Edgehog.
+#
+# Copyright 2023 SECO Mind Srl
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+cryptography
+pyjwt