add heaptrack trace format (#7849)

### Description

allow to load heaptrack files with the turbo-trace-viewer

### Testing Instructions

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  Give a quick description of steps to test your changes.
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Closes PACK-2848

crates/turbopack-trace-server/Cargo.toml

@@ -21,7 +21,9 @@ intervaltree = "0.2.7"
 itertools = { workspace = true }
 owo-colors = { workspace = true }
 postcard = { workspace = true }
+rustc-demangle = "0.1"
 serde = { workspace = true }
 serde_json = { workspace = true }
 turbopack-trace-utils = { workspace = true }
 websocket = { version = "0.27.0", features = ["sync"] }
+zstd = { version = "0.13.0" }

crates/turbopack-trace-server/src/bottom_up.rs

@@ -1,4 +1,4 @@
-use std::{collections::HashMap, sync::Arc};
+use std::{collections::HashMap, env, sync::Arc};
 
 use either::Either;
 
@@ -38,6 +38,10 @@ impl SpanBottomUpBuilder {
 pub fn build_bottom_up_graph<'a>(
  spans: impl IntoIterator<Item = SpanRef<'a>>,
 ) -> Vec<Arc<SpanBottomUp>> {
+ let max_depth = env::var("BOTTOM_UP_DEPTH")
+ .ok()
+ .and_then(|s| s.parse().ok())
+ .unwrap_or(usize::MAX);
  let mut roots = HashMap::new();
  let mut current_iterators = vec![Either::Left(
  spans.into_iter().flat_map(|span| span.children()),
@@ -54,7 +58,7 @@ pub fn build_bottom_up_graph<'a>(
  .or_insert_with(|| (name.to_string(), SpanBottomUpBuilder::new(child.index())));
  bottom_up.self_spans.push(child.index());
  let mut prev = None;
- for &(name, example_span) in current_path.iter().rev() {
+ for &(name, example_span) in current_path.iter().rev().take(max_depth) {
  if prev == Some(name) {
  continue;
  }