Use byte indexes instead of lines and columns

> I think lines and columns is an LSP & display concern and we should remove it from deno_graph. I think deno_graph should just return byte indexes or at least have both. It would also be good to standardize any unit types with deno_ast (so probably just use swc's Span for ranges... or maybe we could make our own type that uses usize and easily converts to an swc span)

[discussion_r767983595](https://github.com/denoland/deno/pull/13074#discussion_r767983595)

Start with the linked discussion and inspect deno_graph's existing line-and-column range APIs. Compare their unit types with deno_ast and swc's Span, then clarify which representation the project should standardize on. Done means the agreed range representation is consistently exposed by deno_graph and its callers are updated.

Written by the indexing model from the issue text.