dora_next_event()'s delay is too long

[lassloss]

Here are some examples of successes and failures during my testing:

1. C++version, transfer 1.3 MB images, use current compiled target/debug/dora to run the project, and the delay in obtaining images is about 100ms when dora_next_event() is used. If using the directly downloaded compiled dora(v0.3.5) to run XXX.yml, the delay is 4ms (only for versions before July 19th).
2. In versions after July 19th, when running the official example using downloaded compiled dora, the second node cannot receive the data from the previous node due to deserialization issues. This may be caused by the mismatch between the cargo install dora cli compiled dora and the latest C++library functions. Simultaneously using current compiled target/debug/dora to run the program successfully, but the latency is still around 100ms.