Stub funding/LQT Bank interface

No implementation yet, but this is the shape I think we want.

crates/core/component/funding/Cargo.toml

@@ -13,6 +13,7 @@ component = [
     "cnidarium",
     "penumbra-sdk-proto/cnidarium",
     "penumbra-sdk-community-pool/component",
+    "penumbra-sdk-dex/component",
     "penumbra-sdk-distributions/component",
     "penumbra-sdk-sct/component",
     "penumbra-sdk-shielded-pool/component",
@@ -25,6 +26,7 @@ parallel = [
     "ark-groth16/parallel",
     "decaf377/parallel",
     "decaf377-rdsa/parallel",
+    "penumbra-sdk-dex/parallel",
     "penumbra-sdk-tct/parallel",
     "penumbra-sdk-shielded-pool/parallel",
     "penumbra-sdk-governance/parallel"
@@ -44,6 +46,7 @@ futures = {workspace = true, optional = true}
 metrics = {workspace = true, optional = true}
 penumbra-sdk-asset = {workspace = true, default-features = true}
 penumbra-sdk-community-pool = {workspace = true, default-features = false}
+penumbra-sdk-dex = {workspace = true, default-features = true}
 penumbra-sdk-distributions = {workspace = true, default-features = false}
 penumbra-sdk-governance = {workspace = true, default-features = false}
 penumbra-sdk-keys = {workspace = true, default-features = false}

crates/core/component/funding/src/component/liquidity_tournament/bank.rs

@@ -0,0 +1,32 @@
+use async_trait::async_trait;
+use cnidarium::StateWrite;
+use penumbra_sdk_dex::lp::position;
+use penumbra_sdk_keys::Address;
+use penumbra_sdk_num::fixpoint::U128x128;
+
+#[allow(dead_code)]
+#[async_trait]
+/// The bank strictly controls issuance of rewards in the liquidity tournament.
+///
+/// This ensures that rewards do not exceed the issuance budget, and are immediately
+/// debited from the appropriate source (which happens to be the community pool),
+/// and credited towards the appropriate destination (i.e. positions or new notes).
+pub trait Bank: StateWrite {
+    /// Move a fraction of our issuance budget towards an address, by minting a note.
+    async fn reward_fraction_to_voter(
+        &mut self,
+        _fraction: U128x128,
+        _voter: &Address,
+    ) -> anyhow::Result<()> {
+        unimplemented!()
+    }
+
+    /// Move a fraction of our issuance budget towards a position, increasing its reserves.
+    async fn reward_fraction_to_position(
+        &mut self,
+        _fraction: U128x128,
+        _lp: position::Id,
+    ) -> anyhow::Result<()> {
+        unimplemented!()
+    }
+}

crates/core/component/funding/src/component/liquidity_tournament/mod.rs

@@ -0,0 +1 @@
+pub mod bank;