python-typing-extensions: add new package

Note:
Dependency for python3-aiohttp

Signed-off-by: Jan Pavlinec <jan.pavlinec@nic.cz>

lang/python/python-typing-extensions/Makefile

+#
+# Copyright (C) 2021 CZ.NIC, z. s. p. o. (https://www.nic.cz/)
+#
+# This is free software, licensed under the GNU General Public License v2.
+# See /LICENSE for more information.
+#
+
+include $(TOPDIR)/rules.mk
+
+PKG_NAME:=python-typing-extensions
+PKG_VERSION:=3.7.4.3
+PKG_RELEASE:=1
+
+PYPI_NAME:=typing-extensions
+PYPI_SOURCE_NAME:=typing_extensions
+PKG_HASH:=99d4073b617d30288f569d3f13d2bd7548c3a7e4c8de87db09a9d29bb3a4a60c
+
+PKG_MAINTAINER:=Jan Pavlinec <jan.pavlinec@nic.cz>
+PKG_LICENSE:=PSF-2.0
+PKG_LICENSE_FILES:=LICENSE
+
+include ../pypi.mk
+include $(INCLUDE_DIR)/package.mk
+include ../python3-package.mk
+
+define Package/python3-typing-extensions
+  SUBMENU:=Python
+  SECTION:=lang
+  CATEGORY:=Languages
+  TITLE:=Module with type hints for Python
+  URL:=https://github.com/python/typing
+  DEPENDS:= \
+	+python3-light
+endef
+
+define Package/python3-typing-extensions/description
+  Backported and Experimental Type Hints for Python.
+endef
+
+$(eval $(call Py3Package,python3-typing-extensions))
+$(eval $(call BuildPackage,python3-typing-extensions))
+$(eval $(call BuildPackage,python3-typing-extensions-src))