feature/1214 session fetch refactor (#1215)

* chore(docs): remove token economy guide

* refactor(context): update GatewayContext to use Querier interface

* chore(database): update schema path

* docs: Update READMEs for x/did, x/dwn, and x/svc with UCAN integration

* chore(pkg): update database scope name

* refactor(did): optimize GenesisState proto methods

* refactor(svc): update Service proto to use repeated fields

* refactor(api): rename MsgSpawn to MsgInitialize

x/dwn/keeper/msg_server.go

@@ -34,10 +34,3 @@ func (ms msgServer) Initialize(ctx context.Context, msg *types.MsgInitialize) (*
 	panic("Initialize is unimplemented")
 	return &types.MsgInitializeResponse{}, nil
 }
-
-// Spawn implements types.MsgServer.
-func (ms msgServer) Spawn(ctx context.Context, msg *types.MsgSpawn) (*types.MsgSpawnResponse, error) {
-	// ctx := sdk.UnwrapSDKContext(goCtx)
-	panic("Spawn is unimplemented")
-	return &types.MsgSpawnResponse{}, nil
-}