fileservice: add S3FS.restoreFromDiskCache #48

Job	Run time
BUILD MO DOCKER IMAGE	4m 19s
e2e BVT Test on Darwin/ARM64(LAUNCH, PESSIMISTIC)	15m 16s
Multi-CN e2e BVT(Race) Test on Linux/x64	42m 25s
SETUP MO TEST ENV	2m 23s
MO CHECKIN BVT TEST	13m 7s
SYSBENCH TEST	22m 36s
TPCC TEST	18m 18s
MO CHECKIN SSB AND TPCH TEST	13m 9s
CLEAN ENV AND NOTICE	3m 48s
	2h 15m 21s

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