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.
Fixes #470
This commit increases size:
out/release/gen/bundle/main.js 7.3M -> 7.9M
out/release/gen/bundle/main.js.map 11M -> 12M
out/release/gen/snapshot_deno.bin 34M -> 37M
out/release/deno 49M -> 53M
Note the amount in the JS code added is quite small:
4.0K node_modules/text-encoding/index.js
4.0K node_modules/@types/text-encoding/index.d.ts
4.0K js/text_encoding.ts
Unclear to me what is causing the jump in snapshot size.
