Introduce the product sdk_with_runtime_apis

This product is an extension of the sdk product, and allows the
"runtime" api stub artifacts are exported to the dist directory and used
to generate the stubs.

Test: lunch sdk_with_runtime_apis-trunk_staging-eng && m sdk dist
Bug: 326312949
Change-Id: I96f6c1f5a5e7b40165d55ea4c0898a880ed62c96