feat: Add eureka capabilities (#2342)

Author: jawoznia

docs/CAPABILITIES-BUILT-IN.md

@@ -11,6 +11,8 @@ might define others.
   "Stargate". It primarily includes protobuf messages and IBC support.
 - `staking` is for chains with the Cosmos SDK staking module. There are Cosmos
   chains that don't use this (e.g. Tgrade).
+- `eureka` is for messages and queries that came with the Cosmos SDK upgrade
+  "Eureka".
 - `cosmwasm_1_1` enables the `BankQuery::Supply` query. Only chains running
   CosmWasm `1.1.0` or higher support this.
 - `cosmwasm_1_2` enables the `GovMsg::VoteWeighted` and `WasmMsg::Instantiate2`

packages/std/Cargo.toml

@@ -29,6 +29,8 @@ staking = []
 # stargate enables stargate-dependent messages and queries, like raw protobuf messages
 # as well as ibc-related functionality
 stargate = []
+# eureka enables eureka-dependent messages and queries
+eureka = []
 # This feature makes `BankQuery::Supply` available for the contract to call, but requires
 # the host blockchain to run CosmWasm `1.1.0` or higher.
 cosmwasm_1_1 = []

packages/std/src/exports.rs

@@ -44,6 +44,10 @@ extern "C" fn requires_staking() {}
 #[no_mangle]
 extern "C" fn requires_stargate() {}
 
+#[cfg(feature = "eureka")]
+#[no_mangle]
+extern "C" fn requires_eureka() {}
+
 #[cfg(feature = "cosmwasm_1_1")]
 #[no_mangle]
 extern "C" fn requires_cosmwasm_1_1() {}

packages/std/src/results/cosmos_msg.rs

@@ -6,6 +6,7 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 
 use crate::coin::Coin;
+#[cfg(feature = "eureka")]
 use crate::eureka::EurekaMsg;
 #[cfg(feature = "stargate")]
 use crate::ibc::IbcMsg;
@@ -85,6 +86,7 @@ pub enum CosmosMsg<T = Empty> {
     Wasm(WasmMsg),
     #[cfg(feature = "stargate")]
     Gov(GovMsg),
+    #[cfg(feature = "eureka")]
     Eureka(EurekaMsg),
 }
 
@@ -110,6 +112,7 @@ impl<T> CosmosMsg<T> {
             CosmosMsg::Wasm(msg) => CosmosMsg::Wasm(msg),
             #[cfg(feature = "stargate")]
             CosmosMsg::Gov(msg) => CosmosMsg::Gov(msg),
+            #[cfg(feature = "eureka")]
             CosmosMsg::Eureka(msg) => CosmosMsg::Eureka(msg),
         })
     }
@@ -488,6 +491,7 @@ impl<T> From<GovMsg> for CosmosMsg<T> {
     }
 }
 
+#[cfg(feature = "eureka")]
 impl<T> From<EurekaMsg> for CosmosMsg<T> {
     fn from(msg: EurekaMsg) -> Self {
         CosmosMsg::Eureka(msg)