featurestore

https://github.com/4paradigm/OpenMLDB/blob/3fc54ff04164cd1bc368ad451b1ee55a1e08abc5/CMakeLists.txt#L208-L210

If we can't find icu package, we will try to find the libraries one by one.
But the message is confused, users might think it's a build error. Plz fix it.

e.g.
"ICU package Not Found" -> "ICU find_package failed, try to use find_library to find"

When creating a shape datastore using create_shp_datastore() in the created store's shapefile location is setting as an absolute path (E.g.: file:/D:/Geoserver/data_dir/data/workspace_name/datastore_name/data.shp) unlike when creating coveragestores, the fie location is set to the relative path. E.g. : file:data/workspace_name/rasterstore_name/raster.geotiff.
This leads to unavailability of th