Define an object for collecting DSLX interpreter events. #3057
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The newly defined DslxInterpreterEvents gathers assert and trace messages from the DSLX interpreter replacing the previous trace hook mechanism. It stores information in the same proto as the IR interpreter does which enables easier comparison of behavior between the interpreters and the sharing of tools. Also augment the proto with additional information like source information.
Also add a utility dump_call_trace which reads an events proto and prints a structured trace of the calls.