C++: Add cpp/extraction-information query

[paldepind]

This PR adds a cpp/extraction-information query similar to the $LANG/extraction-information query for Rust, Java, and C#.

The implementation is consistent with the other languages. For now the query only includes metrics for resolved calls. The difference between this metric and the "Calls with explicit target" in cpp/telemetry/extraction-metrics is that only call in the source are considered.

This distinction is important for evaluating BMN with dependency installation. In the table below the first row shows the existing metric and the remaining rows show the new metric for the project nmap.

We believe that dependency installation has a detrimental effect on this project, but the existing metric looks like an improvement. This is because a lot of additional calls are added in dependencies which causes the number to increase. We the new metric the degradation in the database is clear.

	traced	BMN	BMN + deps inst
Existing call with explicit target	41,261	43,192	51,688
Percentage of calls with call target	100	79.18	71.709
Number of calls with call target	28,983	28,983	22,729
Number of calls with missing call target	0	7,621	8,967

Note that I didn't modify the existing cpp/telemetry/extraction-metrics for two reasons:

• Going forward I think we should use cpp/extraction-information for consistency with other languages.
• I didn't want to break anything existing. Maybe cpp/telemetry/extraction-metrics is hooked up to some telemetry and dashboards?