Add pdu_length field into related atoms

It is needed to know the payload length for outgoing sms to measure the actual throughput for satellite service

Flag: EXEMPT bug fix
Bug: 407545648
Test: atest MerticsCollectorTest PersistAtomsStorageTest
Test: manually run sms and check atom db in live network https://b.corp.google.com/issues/407857553#comment5
Change-Id: I58fc6bbd999d9030cc98a24b5d0c867cab5a4acc