Support op::create(rewriter, <args>) style builders

One of the nicest Quality of Life improvements in MLIR has been the introduction of op::create builders that (unlike rewriter.create(...)) work with IDE autocomplete/etc, and also produce useful error messages instead of obscure template stuff.

Veir should have these for all ops, too. In an ideal world, they're somehow auto-generated, but even having to hand-write them would be better than not having them :)

The issue names no files, tests, or entry points. Start by locating the existing op::create and rewriter.create(...) builder definitions, then inventory how operations are defined. Done means every operation supports the requested op::create(rewriter, ) style with useful errors and IDE-friendly arguments.

Written by the indexing model from the issue text.