pdl: Add more byte element canonical tests

Tag: #feature
Bug: 233339811
Bug: 233339099
Test: atest pdl_tests pdl_rust_generator_tests_{le,be}
(cherry picked from https://android-review.googlesource.com/q/commit:84ecd1c1138132d90a9abb7cb0e977ec61817460)
Merged-In: I9715a489dd9f6236e5445d0b4efc6fab04e46764
Change-Id: I9715a489dd9f6236e5445d0b4efc6fab04e46764