Create QRE traces from cirq circuits

[msoeken]

This adds support to generate traces from cirq circuits. These traces represent the original circuit and do not simply represent the gate counts. They monkey patch a _to_trace method to cirq gates and users of QRE can add a _to_trace method to their custom operations and gates. If no such method is found, the operation's or gate's decomposition method will be called to walk the circuit tree.

The PR has some other small fixes:

• extending the gate-based architecture gate set
• minor fixes to Trace Python API
• minor improvements on how to create estimation table results (with extended info such as source ISA tree) from unannotated estimation results