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, 0 insertions, 0 deletions

diff --git a/third_party b/third_party
-Subproject b9427d8eee3bf17c4d1281e88f0ef7b611f13c9
+Subproject 2f1a94bafe78962c39f51bb4249cfe19fe11879