Refactor library RPC implementation of `admire::deploy_adhoc_storage`

The actual implementation of the RPC should be moved to admire::detail in impl.[ch]pp similarly to other RPCs.

This should include:

• Changing all C-types to CXX types.
• Updating RPC types to fit the new semantics.
• Updating scord RPC handlers to process new args.
• Executing the GekkoFS deployment script.
• Updating C++ examples to fit the new API
• Since errors can occur but there's no output arg, the return type of the new function should simply be a admire::error_code.

This task also probably requires:

• Redefining the RPC types for the RPC defined in rpc_types.[ch]pp