feat: also allow modules for metavariable-name

[kopecs]

Similar to type and types, extends the existing support for module to also allow for modules.

• 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 v1.29.0
Skipping v1.30.0 because commit 78720c795cd5a186f5102c87125ef876c6435a0c has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.33.0
Skipping v1.33.1 because commit 8849e56ddb0977e38a120a6cfbd1c396eb6fa15e has already been checked
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.34.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.39.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.49.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.52.0
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Checking backward compatibility of semgrep_output_v1.atd against past version v1.54.2
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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 v1.61.0
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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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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 v1.79.0
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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

[yosefAlsuhaibani]

🙈

[aryx]

thanks for this one!