[FEATURE]: Support OpenTelemetry 0.32 (unblocks 32-bit targets without native 64-bit atomics)

[anex-johnson-anchor]

Crate Name

datadog-opentelemetry

Crate Version(s)

0.4.0

Describe the goal of the feature

Bump the OpenTelemetry stack from 0.31 to 0.32 in the workspace, so datadog-opentelemetry can be used on 32-bit targets that lack native 64-bit atomics.

Concretely:

• opentelemetry, opentelemetry_sdk, opentelemetry-otlp, opentelemetry-semantic-conventions: 0.31.0 → 0.32 (workspace root Cargo.toml, the pins the published crate inherits).
• dev/example/bridge deps for consistency: tracing-opentelemetry 0.32 → 0.33 (the release paired with otel 0.32), opentelemetry-appender-log/opentelemetry-appender-tracing/opentelemetry-stdout/opentelemetry-http 0.31 → 0.32.

Is your feature request related to a problem?

We wish to make datadog work on 32-bit platform

Describe alternatives you've considered

We dropped datadog-opentelemetry and rebuilt the pipeline directly on opentelemetry + opentelemetry-otlp 0.32 — OTLP/HTTP with a custom blocking HttpClient, exporting to a local Datadog Agent's OTLP receiver. It works and compiles on the 32-bit target, but it means maintaining the integration ourselves and forgoing the Datadog-specific layer the wrapper provides (sampling, propagation, span/resource mapping, native trace export to the Agent). A version bump would let us return to the wrapper.

Additional context

No response