make version(...) kwargs explicit (#36998)

- [x] Replace `version(ver, checksum=None, **kwargs)` signature with
      `version(ver, checksum=None, *, sha256=..., ...)` explicitly listing all arguments.
- [x] Fix various issues in packages:
  - `tags` instead of `tag`
  - `default` instead of `preferred`
  - `sha26` instead of `sha256`
  - etc

Also, use `sha256=...` consistently.

Note: setting `sha256` currently doesn't validate the checksum length, so you could do
`sha256="a"*32` and it would get checked as `md5`... but that's something for another PR.

var/spack/repos/builtin.mock/packages/netlib-blas/package.py

@@ -10,6 +10,6 @@ class NetlibBlas(Package):
     homepage = "http://www.netlib.org/lapack/"
     url = "http://www.netlib.org/lapack/lapack-3.5.0.tgz"
 
-    version("3.5.0", "b1d3e3e425b2e44a06760ff173104bdf")
+    version("3.5.0", md5="b1d3e3e425b2e44a06760ff173104bdf")
 
     provides("blas")