Add a metric to record how many interface fields are resolved

[ihji]

This PR is for https://github.com/semgrep/semgrep-proprietary/pull/2345

• I ran make setup && make to update the generated code after editing a .atd file (TODO: have a CI check)
• I made sure we're still backward compatible with old versions of the CLI.
  For example, the Semgrep backend need to still be able to consume data generated
  by Semgrep 1.17.0.
  See https://atd.readthedocs.io/en/latest/atdgen-tutorial.html#smooth-protocol-upgrades

[github-actions]

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[aryx]

I need to be convinved there is a used for those metrics; otherwise not
worth the added complexity.

[aryx]

I don't think we want to collect such metrics. If you're interested in improving our name resolution, just do some benchmarks and extend the metrics in Stat_code.ml (which is used in Graph_code_SIG_SAST.ml for example).

Let's say we collect those metrics, what will you do based on the value?