Investigate large size of rust debug builds

[lmbollen]

Our Rust debug builds result in very large binaries. Below you find a table that compares the Instruction memory size for two different executables in bytes.

Binary	Release	Debug
hello	872	33608
smoltcp_echo	28868	205470

If we want to be able to produce both debug builds and release builds for the same design without having extremely large memories (or having to resynthesize).

It would be interesting to see what options we have to reduce the file size.