process.py: add ABC MemoryProcess with support for spliting based on read times

This PR adds a new type of process ABC, MemoryProcess, to which the common code of MemoryVariable and PlainMemoryVariable is moved. MemoryProcess also lets the user split a process in two, based on the multiple read accesses that can exist in a MemoryProcess.

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• #251

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In the Comparison with folding memory assignment example, the add1.0 memory variable is now split into two memory variables, where the zero lifetime variable add1.0 is moved to direct_interconnect with split_on_length(length=0).

mem_vars = schedule.get_memory_variables()
direct, mem_vars = mem_vars.split_on_length()
for i, mem in enumerate(mem_vars_set):
    memory = Memory(mem, memory_type="RAM", entity_name=f"memory{i}")
    memory.assign("left_edge")
    memory.show_content(title=f"Assigned {memory.entity_name}")
direct.show(title="Direct interconnects")

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• 8037c620 - 1 commit from branch master
• 6d81535e - process.py: add ABC MemoryProcess with support for spliting based on read times

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