Auto-instrument tracing spans around Dynamic Module C-ABI invocations

*Title*: *Auto-instrument tracing spans around Dynamic Module C-ABI invocations*

*Description*:

Currently, the execution time of a Dynamic Module is opaque in Envoy's distributed traces. We need Envoy's native C++ filter wrapper to automatically create a child span around the C-ABI invocation to measure its processing latency.

Use Case
Operators need to profile and monitor the latency overhead introduced by custom dynamic modules without forcing the module authors to write boilerplate tracing code inside the .so. Specifically, we need visibility into exactly how much time is spent inside the C-ABI hooks (e.g., on_request_headers, on_request_body) within a request's overall trace.

[optional *Relevant Links*:]

Similar to https://github.com/envoyproxy/envoy/issues/20850