chore: bump workspace version to 35.0.0 (#2068)

#What does this PR do?

  Bumps the libdatadog workspace version from 34.0.0 → 35.0.0 (Cargo.toml + regenerated Cargo.lock) to cut the 35.0.0 release.

  Breaking changes affecting the FFI layer (34.0.0 → 35.0.0)

  1. Tracer FFI: response body now returned as ByteSlice (#2029) — feat!
  - ddog_trace_exporter_response_get_body no longer takes an out_len: *mut usize out-parameter and returns *const u8. It now returns a single ByteSlice value, matching the slice
  conventions in libdd-common-ffi.
  - Tracer constructor functions now validate nullable pointers and return ErrorCode::InvalidArgument instead of risking UB; panics across the boundary are caught and surfaced as
  ErrorCode::Panic.
  - C consumers (e.g. dd-trace-rb) can now reuse the standard read_ddogerr_string_and_drop / get_error_details_and_drop helpers from datadog_ruby_common.h.
  - Action for callers: drop the out_len argument and read length/pointer from the returned ByteSlice.

  2. Crashtracker: error.threads flattened to []ThreadData (#2054) — fix(crashtracking)!
  - The crash-report payload now emits error.threads as an optional flat array of thread objects (unified runtime stack schema 1.8) instead of the previous nested threads object.
  - This is a wire/payload-format change consumed by downstream pipelines and the product UI.
  - Action for callers: consumers parsing crash reports must update to the 1.8 thread layout.

  Other breaking changes since 34.0.0 (Rust API, not C ABI)

  These are !-marked breaking changes in libdd-trace-utils that affect Rust consumers of the library but do not change the C FFI surface or generated headers:

  - feat(trace-utils)!: introduce VecMap datastructure (#2022) — adds a HashMap replacement optimized for span construction (not yet wired into span fields).
  - feat(trace-utils)!: add from_string to span text (#2011) — requires From<String> on SpanText and switches SpanSlice to Cow<str> to allow span-field mutation/normalization.

  Notable new FFI surface (additive)

  - feat: Add FFI for trace exporter (#1952) — new tracer FFI surface in libdd-data-pipeline-ffi (the change above, #2029, refines it).


Co-authored-by: julio.gonzalez <julio.gonzalez@datadoghq.com>

Author: hoolioh

Cargo.lock

@@ -74,7 +74,7 @@ resolver = "2"
 [workspace.package]
 rust-version = "1.87.0"
 edition = "2021"
-version = "34.0.0"
+version = "35.0.0"
 license = "Apache-2.0"
 authors = ["Datadog Inc. <info@datadoghq.com>"]