feat: add padding keyword to increase program size #183

Job	Run time
Prepare	7s
Docs - stable toolchain (recent)	53s
Check WASM	36s
Test - stable toolchain	3m 54s
Docs - nightly toolchain (recent)	1m 11s
Test - nightly toolchain	4m 18s
Lint - nightly toolchain (recent)	46s
Format - nightly toolchain	17s
Test - MSRV	4m 48s
Check Fuzz	43s
	17m 33s

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