build: specify library feature to imported contracts

when linking a contract to another we may encounter C symbol duplication
caused by the export of contract's entrypoints, we avoid that this way.

Cargo.toml

@@ -10,8 +10,8 @@ cw-storage-plus = "1.2.0"
 cw-utils = "1.0.2"
 cw2 = "1.1.1"
 okp4-logic-bindings = { path = "packages/okp4-logic-bindings" }
-okp4-objectarium = { path = "contracts/okp4-objectarium" }
-okp4-cognitarium = { path = "contracts/okp4-cognitarium" }
+okp4-objectarium = { path = "contracts/okp4-objectarium", features = ["library"] }
+okp4-cognitarium = { path = "contracts/okp4-cognitarium", features = ["library"] }
 okp4-objectarium-client = { path = "packages/okp4-objectarium-client" }
 schemars = "0.8.16"
 serde = { version = "1.0.192", default-features = false, features = ["derive"] }