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What does this PR do?
Add a ddtelemetry-ffi crate that exposes a FFI to submit telemetry data.
The telemetry bindings support:
This ffi code includes macro_rules that generate accessors for rust on structs. For these accessors to be processed by cbindgen, we beed to use the nightly version of the toolchain.
Things that are not included, but plan to add in further PRs:
Motivation
Additional Notes
Anything else we should know when reviewing?
How to test the change?
Describe here in detail how the change can be validated.