Implement generic advice-scanning AdviceProcessor

[sarahchen6]

What Does This Do

Replace the muzzle-specific Gradle plugin with a generic advice-scanning AdviceProcessor pipeline that produces a "neutral" scanned result. Muzzle then consumes this neutral scanned result through MuzzleGenerationProcessor to preserve the existing $Muzzle.create() output and behavior.

Motivation

Separating scanning from Muzzle generation allows us to experiment with other build-time advice generation, such as for instrumentation helper class generation.

Additional Notes

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: [PROJ-IDENT]

[datadog-prod-us1-3]

🎯 Code Coverage (details)
• Patch Coverage: 0.00%
• Overall Coverage: 60.22% (+1.19%)

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 2c0e0f6 | Docs | View more details | Give us feedback!}

[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	14.81 s	14.72 s	[-0.2%; +1.5%] (no difference)
startup:insecure-bank:tracing:Agent	13.63 s	13.72 s	[-1.3%; +0.0%] (no difference)
startup:petclinic:appsec:Agent	16.90 s	16.75 s	[-0.1%; +1.8%] (no difference)
startup:petclinic:iast:Agent	16.84 s	16.89 s	[-1.2%; +0.6%] (no difference)
startup:petclinic:profiling:Agent	16.67 s	16.22 s	[-1.8%; +7.2%] (no difference)
startup:petclinic:sca:Agent	16.78 s	15.97 s	[+0.7%; +9.4%] (maybe worse)
startup:petclinic:tracing:Agent	16.18 s	16.18 s	[-0.9%; +0.9%] (no difference)

Commit: 2c0e0f6b · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.