feat: add get all versions (#11124)

* add get all versions

* add changelog entry

CHANGELOG.md

@@ -119,6 +119,7 @@ Ref: https://keepachangelog.com/en/1.0.0/
 * [\#10816](https://github.com/cosmos/cosmos-sdk/pull/10816) Reuse blocked addresses from the bank module. No need to pass them to distribution. 
 * [\#10852](https://github.com/cosmos/cosmos-sdk/pull/10852) Move `x/gov/types` to `x/gov/types/v1beta2`.
 * [\#10868](https://github.com/cosmos/cosmos-sdk/pull/10868), [\#10989](https://github.com/cosmos/cosmos-sdk/pull/10989), [\#11093](https://github.com/cosmos/cosmos-sdk/pull/11093) The Gov keeper accepts now 2 more mandatory arguments, the ServiceMsgRouter and a gov Config including the max metadata length.
+* [\#11124](https://github.com/cosmos/cosmos-sdk/pull/11124) Add `GetAllVersions` to application store
 * (x/authz) [\#10447](https://github.com/cosmos/cosmos-sdk/pull/10447) authz `NewGrant` takes a new argument: block time, to correctly validate expire time.
 
 ### Client Breaking Changes

store/iavl/store.go

@@ -143,6 +143,11 @@ func (st *Store) VersionExists(version int64) bool {
 	return st.tree.VersionExists(version)
 }
 
+// GetAllVersions returns all versions in the iavl tree
+func (st *Store) GetAllVersions() []int {
+	return st.tree.AvailableVersions()
+}
+
 // Implements Store.
 func (st *Store) GetStoreType() types.StoreType {
 	return types.StoreTypeIAVL

store/iavl/tree.go

@@ -31,6 +31,7 @@ type (
 		GetVersionedWithProof(key []byte, version int64) ([]byte, *iavl.RangeProof, error)
 		GetImmutable(version int64) (*iavl.ImmutableTree, error)
 		SetInitialVersion(version uint64)
+		AvailableVersions() []int
 	}
 
 	// immutableTree is a simple wrapper around a reference to an iavl.ImmutableTree
@@ -92,3 +93,7 @@ func (it *immutableTree) GetImmutable(version int64) (*iavl.ImmutableTree, error
 
 	return it.ImmutableTree, nil
 }
+
+func (it *immutableTree) AvailableVersions() []int {
+	return []int{}
+}