iss: Add conditional exit of cosimulation based on instruction address and memory writes

[Giftzwerg02]

This PR adds new configuration options to tell the Co-Simulation broker to stop Co-Simulation before the clients finished executing. It is now possible to exit if a certain address is reached or if a memory write at some address (and some written value) occurred. These addresses / values can either be constant values or symbols based on the input file.

For example, if you want to exit on the label cosim_exit (assume that this label has a fixed location of 0x12345678), given some assembly:

_start:
    insn1...
    insn2...
    insn3...
cosim_exit:
    insn4...
    insn5...

Either set the following flag when executing the broker:

• --exit-on-exec "cosim_exit" (by label/symbol name)
• --exit-on-exec "0x12345678" (by hex value)
• --exit-on-exec "305419896" (by decimal value)

Or through the config file under [testing.exit_condition]:

• on_address = 0x12345678
• on_address = 305419896
• on_label = "cosim_exit" (setting on_label overrides on_address)

Checking memory writes is still WIP ( @Jozott00 )

[Jozott00]

Looks very good! I think once the exit on write with value is implemented, we can merge this.