package dependency clean-ups (#531)

this change just cleans up dependency declarations in xmake.lua files, discovered while exploring a more to xrepo which catches dependency problems since it will not just place all includes in a single directory, unlike vcpkg.

* removed spurious asio dependency from zenserver-test
* removed rocksdb reference
* add missing asio package dependency
* removed catch2 reference (no longer available)
* added explicit cpr reference
* made some zencore package dependencies public (this is necessary because some public zencore headers pull in package headers. If you use a more strict package manager than vcpkg then you get compilation errors whenever these includes are pulled in unless you declare the dependency explicitly)

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