block-padding: merge `Padding` and `RawPadding` traits (#1217) #883

Job	Run time
build (1.85.0, armv7a-none-eabi)	19s
build (1.85.0, thumbv7em-none-eabi)	13s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, thumbv7em-none-eabi)	20s
cross (aarch64-unknown-linux-gnu, stable)	43s
x86 (x86_64-unknown-linux-gnu, stable)	21s
cross (powerpc-unknown-linux-gnu, stable)	48s
minimal-versions / minimal-versions	56s
x86 (x86_64-unknown-linux-gnu, 1.85.0)	20s
build (stable, armv7a-none-eabi)	21s
cross (aarch64-unknown-linux-gnu, 1.85.0)	51s
cross (powerpc-unknown-linux-gnu, 1.85.0)	50s
build (stable, wasm32-unknown-unknown)	22s
test (x86_64-unknown-linux-gnu, ubuntu-latest, stable)	18s
test (i686-unknown-linux-gnu, ubuntu-latest, stable, sudo apt update && sudo apt install gcc-mult...	31s
test (x86_64-pc-windows-msvc, windows-latest, stable)	45s
test (x86_64-apple-darwin, macos-latest, 1.85.0)	16s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.85.0)	16s
test (i686-unknown-linux-gnu, ubuntu-latest, 1.85.0, sudo apt update && sudo apt install gcc-mult...	44s
test (x86_64-pc-windows-msvc, windows-latest, 1.85.0)	31s
test (x86_64-apple-darwin, macos-latest, stable)	24s
	10m 27s

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