Replace SortedVector and maps with Vector in Transactions

Align the data in client so we can remove some duplicate parcelling and
clean up the interface to sf.

micro benchmark results (atest libgui_benchmarks) shows slight
improvements when merging and applying transactions. 5-10%

Note: we would ideally switch to std::vector but this would involve more
changes. Once we clean up the interfaces to sf, changing the container
would be easier.

Flag: EXEMPT refactor
Bug: 385156191
Test: presubmit
Change-Id: I2f14236e5f571af192d371b7b58f0a0fa0c62f49