Implement PEP-517/518 build system locking. #3339

Job	Run time
Check GitHub Organization	1s
tox -e format-check,lint-check,typecheck,enum-check,vendor-check,package,docs	11m 7s
tox -e py313-pip24_3_1	15m 28s
./dtox.sh -e py27-pip20	9m 57s
tox -e py313-pip24_3_1-integration --shard 1/2	25m 16s
./dtox.sh -e py38-pip22_3_1	16m 25s
tox -e py313-pip24_3_1-integration --shard 2/2	27m 42s
./dtox.sh -e py311-pip23_3_2	17m 5s
./dtox.sh -e py313-pip24_3_1	13m 11s
./dtox.sh -e py314-pip24_3_1	12m 50s
./dtox.sh -e pypy310-pip24_3_1	29m 5s
./dtox.sh -e py27-pip20-integration	29m 26s
./dtox.sh -e py38-pip22_3_1-integration --shard 1/2	30m 28s
./dtox.sh -e py38-pip22_3_1-integration --shard 2/2	26m 34s
./dtox.sh -e py311-pip23_3_2-integration --shard 1/2	28m 30s
./dtox.sh -e py311-pip23_3_2-integration --shard 2/2	25m 49s
./dtox.sh -e py313-pip24_3_1-integration --shard 1/2	24m 48s
./dtox.sh -e py313-pip24_3_1-integration --shard 2/2	24m 6s
./dtox.sh -e py314-pip24_3_1-integration --shard 1/2	24m 27s
./dtox.sh -e py314-pip24_3_1-integration --shard 2/2	24m 24s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 1/2	52m 4s
./dtox.sh -e pypy310-pip24_3_1-integration --shard 2/2	50m 52s
Gather Final Status	1s
	8h 39m 36s

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