feature: Improve all functions of the meta

[sjcsjc123]

id	issue	people	process
1	meta method GetStore
2	meta method AddStore
3	meta method RemoveStore
4	meta method GetAllStores
5	meta method GetRegionByID
6	meta method GetStoreByID

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[wangchenguang123]

i finsh write 1，3，4，5 but as you say in https://github.com/ByteStorage/FlyDB/pull/171#issuecomment-1627248915. so i donot know whether my code is right or not so i wait to pr this file

[sjcsjc123]

you can create pr first, i will review it