feat(sca): new SCA stats schema

[salolivares]

Context

The existing "bytes parsed" metric we are currently relying on provides a limited perspective on customer SSC adoption, as it aggregates usage across languages without fully capturing which languages are meaningfully used.

We want to augment the stats schema to improve metrics around Java dependency detection, lockfile-less scanning, and python requirements identification.

• 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]

Backwards compatibility summary:

Checking backward compatibility of semgrep_output_v1.atd against past version v1.49.0
Skipping v1.50.0 because commit 857682f41eb09e0b330a247ff1adf3bfeaf9d9ca has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.52.0
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Skipping v1.54.0 because commit 3b72d494260258497e796d094b1a4916501a6df1 has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.54.2
Skipping v1.54.3 because commit 9f1c50383a9a9969e2fe7a5f9bff9ca0a7c837bb has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.55.0
Skipping v1.55.1 because commit 6dffeaa692153fd33b4f154fddaefde1f2f1ae27 has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.56.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.59.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.61.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.63.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.66.1
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.67.0
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Skipping v1.69.0 because commit d5b91fa4f6a03240db31e9bbbc5376a99bc8eeea has already been checked
Checking backward compatibility of semgrep_output_v1.atd against past version v1.70.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.73.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.77.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.79.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.84.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.90.0
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[aryx]

LGTM