📜 Description

Adds support for homogeneous scalar array attributes on streaming telemetry — usable on spans, logs, and metrics. Four typed factories are added to SentryAttribute:

SentryAttribute.stringArray(List<String> value)
SentryAttribute.intArray(List<int> value)
SentryAttribute.doubleArray(List<double> value)
SentryAttribute.boolArray(List<bool> value)

Each serializes to the wire format {"value": [...], "type": "array"}. StreamingInstrumentationSpan.setData also now maps List<String|int|double|bool> values to these factories; heterogeneous, nullable, and untyped lists fall through to the existing ignore path and are not sent.

The factories are intentionally typed (rather than a single inferring array(List)): the element type is the constraint, so homogeneity is enforced at compile time and List<dynamic>/mixed lists can't be constructed. Logs and metrics required no production change — both already accept Map<String, SentryAttribute> and serialize attributes via the same value.toJson() passthrough as spans, so arrays flow through unchanged.

💡 Motivation and Context

Sentry's attribute protocol ingests homogeneous arrays of primitive types using the array type. This brings the Dart SDK in line so users can attach list-valued dimensions to spans, logs, and metrics. Note: array attributes are ingested but not yet visible in the Sentry UI (server-side limitation). Objects and mixed/nested arrays are not yet supported by the protocol and are intentionally out of scope; the design is additive, so they can be layered on later without breaking changes.

Closes #3665

💚 How did you test it?

• Unit tests for each factory verifying the {value, type: 'array'} serialization, including the empty-list case.
• Serialization tests confirming array attributes survive end-to-end on logs, metrics, and the span capture pipeline (i.e. no sink strips them).
• Dispatch tests for setData covering all four list types plus rejection of mixed-element and null-containing lists.
• A debug-formatting test for array attribute output.

The full core SDK suite and analyzer pass green.

📝 Checklist

• I reviewed submitted code
• I added tests to verify changes
• No new PII added or SDK only sends newly added PII if sendDefaultPii is enabled
• I updated the docs if needed
• All tests passing
• No breaking changes

🔮 Next steps

Array attributes are ingested but not yet surfaced in the Sentry UI. Support for object and mixed/nested array attribute values can be added additively (a general array/object factory + matching setData branches) once the protocol and UI support them.