Get latest available pure python package for each host

This commit creates dedicated asset templates for value of "python_version"
key to make sure PyPiClient downloads latest available package for each
python version.

The issue to solve is that pure python packages don't carry any information
about supported python versions in their name.

   name-1.0.0-py3-any.whl   maybe 3.8+
   name-1.1.0-py3-any.whl   maybe 3.13+

Author: deathaxe

package_control/clients/pypi_client.py

@@ -288,3 +288,18 @@ def _make_download_info(pattern, selectors, version, assets):
             return info
 
         return None
+
+    @staticmethod
+    def _expand_asset_variables(asset_templates):
+        output = []
+        for pattern, spec in JSONApiClient._expand_asset_variables(asset_templates):
+            if len(spec["python_versions"]) == 1:
+                output.append((pattern, spec))
+                continue
+
+            for py_ver in spec["python_versions"]:
+                new_spec = spec.copy()
+                new_spec["python_versions"] = [py_ver]
+                output.append((pattern, new_spec))
+
+        return output