Add json.TokenStream (#1062)
Add json.TokenStream (#1062)

This hides some of the low-level parsing details from the
StreamingParser. These don't need to be known when parsing a complete
slice at once (which is we can usually do).

Also, remove `Json` from Parser names. The namespace `json` is sufficient.
Dimenus/zig,raulgrell/zig,zig-lang/zig,raulgrell/zig,Dimenus/zig,zig-lang/zig,andrewrk/zig,zig-lang/zig,raulgrell/zig,andrewrk/zig,raulgrell/zig,Dimenus/zig,raulgrell/zig