py-natsort: add new variant +icu and dependent package (#48907)

* Add new package py-pyicu to support new py-natsort variant +icu

* note version req location

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

* bound icu variant

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

---------

Co-authored-by: Wouter Deconinck <wdconinc@gmail.com>

var/spack/repos/builtin/packages/py-natsort/package.py

@@ -37,3 +37,7 @@ class PyNatsort(PythonPackage):
     version("4.0.1", sha256="1c1d29150938ca71f0943363a06765dbb2cea01f9c4d760ba880cc65f39baba0")
 
     depends_on("py-setuptools", type=("build"))
+
+    variant("icu", default=False, when="@5.0.3:", description="Use icu for locale sorting")
+
+    depends_on("py-pyicu", type=("build", "run"), when="+icu")

var/spack/repos/builtin/packages/py-pyicu/package.py

@@ -0,0 +1,25 @@
+# Copyright Spack Project Developers. See COPYRIGHT file for details.
+#
+# SPDX-License-Identifier: (Apache-2.0 OR MIT)
+
+from spack.package import *
+
+
+class PyPyicu(PythonPackage):
+    """Python extension wrapping the ICU C++ API"""
+
+    homepage = "https://gitlab.pyicu.org/main/pyicu"
+    pypi = "PyICU/PyICU-2.14.tar.gz"
+
+    maintainers("Chrismarsh")
+
+    license("MIT", checked_by="Chrismarsh")
+
+    version("2.14", sha256="acc7eb92bd5c554ed577249c6978450a4feda0aa6f01470152b3a7b382a02132")
+
+    depends_on("cxx", type="build")
+
+    depends_on("py-setuptools", type="build")
+    depends_on("pkgconfig", type="build")
+
+    depends_on("icu4c@:76")  # ICU_MAX_MAJOR_VERSION in setup.py