feat(types): add 'js' feature for wasm

Enables the "js" feature of postgres-protocol.

postgres-types/Cargo.toml

@@ -13,6 +13,7 @@ categories = ["database"]
 [features]
 derive = ["postgres-derive"]
 array-impls = ["array-init"]
+js = ["postgres-protocol/js"]
 with-bit-vec-0_6 = ["bit-vec-06"]
 with-cidr-0_2 = ["cidr-02"]
 with-chrono-0_4 = ["chrono-04"]