mssmt: add new batched ms-smt leaf insertion with recursive merge update #3812

Job	Run time
Compilation check	1m 56s
cross compilation	12m 15s
Format check	25s
Docker build check	3m 49s
run itests	3m 15s
run itests postgres	3m 29s
Lint check	2m 43s
migration version check	15s
go mod check	24s
RPC check	1m 20s
run LiT tests	5m 43s
sample configuration check	41s
Sqlc check	2m 45s
test vector check	59s
run unit tests (unit-race)	8m 15s
run unit tests (unit-cover)	1m 58s
run unit tests (unit dbbackend=postgres)	4m 41s
finish	9s
	55m 2s

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