Allow setting timeouts from target configuration and retries

[douglas-raillard-arm]

Some platforms (like FPGA) can be really slow (e.g. 200x slower than a normal device). This can make some timeouts unsuitable. We should ensure that the core code allows setting timeouts when creating the target so that the client code of devlib (and devlib itself) does not need to be modified to run on such platforms.

Following the same path, it might be necessary to investigate on timeout support in adb.