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Add spec for a Tracing ABI
Added proxy_set_active_span_tag to the abi. Using this ABI, we should be able to add tag key and value to an active span in case tracing is enabled for a request.
@PiotrSikora Please review this.
I have collected some thoughts on this in https://github.com/corazawaf/coraza-proxy-wasm/issues/166 and https://github.com/envoyproxy/envoy/issues/21959