lazier lazy_wheel

- handle short files `416`; prefetch entire dist-info
- lazy_wheel: translate BadZipfile to InvalidWheel
- handle 501 on negative bytes range from pypi
- catch UnsupportedWheel
- make lazy wheel work against tensorflow-gpu
- link to pypi discussion on negative byte ranges
- check for case when server doesn't support byte ranges at all
- remove _check_zip() method since we do that in prefetch_dist_info() now
- clean up error handling code and don't warn when negative ranges fail
- remove TODO, as Cache-Control: no-cache is the correct behavior
- rearrange explanatory comments

Author: dholth

news/12208.feature.rst

@@ -0,0 +1,2 @@
+Implement lazier lazy_wheel that avoids the HEAD request, fetching the metadata
+for many wheels in 1 request.