Refactor snapshot build (#2825)

Instead of using core/snapshot_creator.rs, instead two crates are
introduced which allow building the snapshot during build.rs.

Rollup is removed and replaced with our own bundler. This removes
the Node build dependency. Modules in //js now use Deno-style imports
with file extensions, rather than Node style extensionless imports.

This improves incremental build time when changes are made to //js files
by about 40 seconds.

1 files changed, 1 insertions, 1 deletions

diff --git a/js/colors.ts b/js/colors.ts
index ab89af81c..47a893036 100644
--- a/js/colors.ts
+++ b/js/colors.ts
@@ -3,7 +3,7 @@
 // TODO(kitsonk) Replace with `deno_std/colors/mod.ts` when we can load modules
 // which end in `.ts`.
 
-import { noColor } from "./os";
+import { noColor } from "./deno.ts";
 
 interface Code {
   open: string;