Split RangingMeasurement proto for each type

Split the RangingMeasurement into separate protos for TwoWay and OwrAoa
ranging. This is required as in a future CL, we will make a change to
store only a singleton for the OwrAoaRangingMeasurement, and this change
makes that easier (in the currently unused proto-based rust code).

Test: atest
Bug: 268567239
Change-Id: Iba641e224b473526b2b43598245ec61e4604a63e
2 files changed