tapgarden: extend GardenKit with delegation and supply commit support

This commit enhances the GardenKit configuration by adding two new
optional dependencies: DelegationKeyChecker and MintCommitter. These
additions enable the garden subsystem to verify delegation key ownership
and submit mint events to the supply commitment state machine.

The GardenKit struct serves as the central configuration hub for the
tapgarden package, and these new fields allow components like the
BatchCaretaker to conditionally enable supply commitment functionality
when the required dependencies are available.

Author: Roasbeef

tapgarden/planter.go

@@ -31,6 +31,16 @@ import (
 	"golang.org/x/exp/maps"
 )
 
+// MintSupplyCommitter is used during minting to update the on-chain supply
+// commitment of a new minted asset.
+type MintSupplyCommitter interface {
+	// SendMintEvent sends a mint event to the supply commitment state
+	// machine.
+	SendMintEvent(ctx context.Context, assetSpec asset.Specifier,
+		leafKey universe.UniqueLeafKey,
+		issuanceProof universe.Leaf) error
+}
+
 // GardenKit holds the set of shared fundamental interfaces all sub-systems of
 // the tapgarden need to function.
 type GardenKit struct {
@@ -81,6 +91,15 @@ type GardenKit struct {
 	// UniversePushBatchSize is the number of minted items to push to the
 	// local universe in a single batch.
 	UniversePushBatchSize int
+
+	// MintSupplyCommitter is used to commit the minting of new assets to
+	// the supply commitment state machine.
+	MintSupplyCommitter MintSupplyCommitter
+
+	// DelegationKeyChecker is used to verify that we control the delegation
+	// key for a given asset, which is required for creating supply
+	// commitments.
+	DelegationKeyChecker address.DelegationKeyChecker
 }
 
 // PlanterConfig is the main config for the ChainPlanter.