taprpc: move `ImportProof` from `tapdevrpc` to `taprpc` #3209

Job	Run time
cross compilation	4m 21s
Format check	24s
Docker build check	3m 9s
Compilation check	52s
run itests	1m 2s
run itests postgres	2m 52s
Lint check	2m 32s
migration version check	14s
go mod check	25s
run LiT tests	11m 31s
sample configuration check	43s
RPC check	1m 15s
Sqlc check	30s
run unit tests (unit-race)	7m 5s
test vector check	51s
run unit tests (unit-cover)	3m 48s
run unit tests (unit dbbackend=postgres)	4m 58s
finish	5s
	46m 37s

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