Add Vec read methods in rust parcel fuzzer

Reading vectors of objects which are not covered.

Test: m parcel_fuzzer_rs && adb sync data && adb shell data/fuzz/x86_64/parcel_fuzzer_rs/parcel_fuzzer_rs
Bug: N/A
Change-Id: Ib8615c9c1a32f931fe7e35f4a9a0c3cde963fbe9