[chain-pr 1/6] Core transport: SdkSource type and Batch export

[johnHackworth]

This PR is part of a chain split from #0 watson/DEBUG-5296/add-live-debugger by chain-pr.

Changes

Extracts shared SdkSource type, exports Batch, and exports computeTransportConfiguration so that the new debugger package can consume them.

Chain

→ #4577 — Core transport: SdkSource type and Batch export
#4578 — Endpoint builder: debugger track and TransportSource
#4579 — Debugger package configuration and tooling
#4580 — Debugger domain implementation and tests
#4581 — E2E framework support for debugger
#4582 — Performance benchmark app and scenario for instrumentation overhead

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Draft — pending author review. Merge in order unless marked parallel.

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[johnHackworth]

testing a bot, not a real PR; Closing.