[turbopack] Add support for debug_ids (#84319)
## What?
Add a new feature to turbopack for generating debug_ids based on the
[TC39 Debug ID
proposal](https://github.com/tc39/ecma426/blob/main/proposals/debug-id.md)
If a user sets `turbopack.debugIds = true` then we will
* register the debug id with the global `_debugIds` object
* this object is keyed by a stack trace for the script. This enables
associating debug ids with stack frames when reporting errors.
* add a ` //# debugId=XXX` comment at the end of the generated code
* add a `"debugId": "XXX"` property to the source map json file
The debug id value is a hash of the file contents using the
`xxhash3_128` hash algorithm represented as a UUID hyphentated string.
One oddity is Indexed source maps. Turbopack uses indexed source maps
for simple performance and 'incremental execution' reasons, but the
debug id spec says that debugIds only apply to non-indexed source maps.
Reading between the lines (thanks @bgw! ), this appears to be a simple
spec issue related to older versions of the indexed-source maps
specification. Adding the debugId to the indexed map is unlikely to be
harmful and the authors agree this should be covered ([see
issue](https://github.com/tc39/ecma426/issues/203)).
## Why?
Debug Ids make javascript source files and source maps self identifying
without relying on URLs. This improves the ability for offline processes
to ensure a proper association regardless of how sources our source maps
are served.
## How?
* thread the `debug_ids` bit from the next config down to the chunking
context and finally to the `Code` structs
* implement a uuid generator that can content address the code to
generate the id
- neither content addressing nor even determinism are _required_ by the
spec but this is the simplest approach. We could use a simple 128 bit
random number, but this is chaotic and goes against our own natural
desires for determinism.
* compute the debug id in a turbotask on the `Code` struct and embed
when generating chunks and source maps.
* add a few tiny snapshot tests to demonstrate the feature.
Fixes PACK-417
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Co-authored-by: Tim Neutkens <tim@timneutkens.nl>
