Get rid of need for dependencies.ts

[alloy]

This is going to go wrong more than once, so we should replace it with something transparent.

The simplest approach looks to be to write code as normal, e.g.:

import { visit } from "graphql"

But then after compiling it we run an additional babel transform or sed script that rewrites it to:

const { visit } = require("./graphql")

…where ./graphql is a module that does the dance to get vscode-apollo’s node_modules.

[alloy]

I just recalled that I wrote this codemod before https://github.com/artsy/codemods/blob/master/src/update-import-source.ts, which we should be able to re-use for this purpose.

[alloy]

I started on a branch here https://github.com/relay-tools/vscode-apollo-relay/tree/fix-dependency-hell but haven't gotten it to work yet.

@kastermester feel free to take a stab at it, if you wish.