Support padding for the leaves of the merkle tree #1294

Job	Run time
check-changed-files / Check Changed Files	10s
extract-cuda-backend-branch / Extract cuda branch name	5s
Check Code Format	12s
Build and test fields on Linux (babybear)	6m 10s
Build and test hash on Linux	1m 9s
Build and test curves on Linux (bn254)	16m 21s
Build and test curves on Linux (bls12_381)	14m 55s
Build and test curves on Linux (bls12_377)	23m 0s
Build and test curves on Linux (bw6_761)	39m 49s
Build and test curves on Linux (grumpkin)	3m 8s
	1h 44m 59s

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