fix(ffi): support custom allocators in event string getters - #8672
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Event string getters returned Rust-allocated pointers that dc_str_unref() frees with libc. This breaks with custom Rust allocators, so allocate the strings with strdup() instead.
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Event string getters returned Rust-allocated pointers that dc_str_unref() frees with libc. This breaks with custom Rust allocators, so allocate the strings with strdup() instead.