chore(dev): add generate-fixtures feature

[thomasqueirozb]

Summary

This cfg-gates the following patch: https://github.com/vectordotdev/vector/blob/v0.54.0/lib/codecs/tests/data/native_encoding/vrl_generate_fixtures.patch

Change Type

• Bug fix
• New feature
• Non-functional (chore, refactoring, docs)
• Performance

Is this a breaking change?

• Yes
• No

How did you test this PR?

See the counterpart Vector PR

Does this PR include user facing changes?

• Yes. Please add a changelog fragment based on
  our guidelines.
• No. A maintainer will apply the "no-changelog" label to this PR.

Checklist

• Our CONTRIBUTING.md is a good starting place.
• If this PR introduces changes to LICENSE-3rdparty.csv, please
  run dd-rust-license-tool write and commit the changes. More details here.

References

• Related: chore(codecs): replace native encoding fixture patch files with cfg-gated code vector#24971

[pront]

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[chatgpt-codex-connector]

Recheck rounded float before returning

In generate-fixtures mode, the pre-filter only rejects NaN/zero before rounding, but (value * 10_000.0).round() / 10_000.0 can still produce signed zero from small negative inputs (for example -0.00001 rounds to -0.0). That means this path can emit the exact -0.0 representation the feature is intended to avoid for stable JSON/protobuf fixtures, so the result should be normalized or validated again after rounding.

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