Fix column offsets for source mapped code

[calebeby]

Closes #189

The problem was, the column offsets were off-by-one when esbuild was disabled, but they were fine when esbuild was enabled.

Something like this:

console.log(nothing)
             ^ ReferenceError: nothing is not defined

The reason for this ended up being that the source-map library uses zero-indexed columns, while almost everything else uses 1-indexed columns. Once I found this out it was easy to fix.

Along the way, I found out that @rollup/plugin-babel doesn't work, so I fixed it (the plugin required that the options hook got called, so I added the options hook to our fake rollup). I think it is important for this plugin to work since it will probably be pretty common for people to a specific babel setup that can't be replaced with esbuild

The tests cover both changes ✅