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8effcac6f5
Added the HTTP header manipulation layer that enables span context injection into and extraction from HAProxy's HTX message buffers, completing the end-to-end context propagation path. The new http.c module implements three public functions: flt_otel_http_headers_get() extracts HTTP headers matching a name prefix from the channel's HTX buffer into an otelc_text_map structure, stripping the prefix and separator dash from header names before storage; flt_otel_http_header_set() constructs a full header name from a prefix and suffix joined by a dash, removes all existing occurrences, and optionally adds the header with a new value; and flt_otel_http_headers_remove() removes all headers matching a given prefix. A debug-only flt_otel_http_headers_dump() logs all HTTP headers from a channel at NOTICE level. The scope runner in event.c now extracts propagation contexts from HTTP headers before processing spans: for each configured extract context, it calls flt_otel_http_headers_get() to read matching headers into a text map, then passes the text map to flt_otel_scope_context_init() which extracts the OTel span context from the carrier. After span execution, the span runner injects the span context back into HTTP headers via flt_otel_inject_http_headers() followed by flt_otel_http_header_set() for each propagation key. The unused resource cleanup in flt_otel_scope_free_unused() now also removes contexts that failed extraction by deleting their associated HTTP headers via flt_otel_http_headers_remove() before freeing the scope context structure.