feat: output unification v2

Outputs root hash merkle tree is the same for all inputs, we stop
resetting it for each input (v1). With that the tree will grow
indefinetely and thus we also increased its depth to 2^63 leafs.

src/cartesi-machine.lua

@@ -2053,7 +2053,7 @@ end
 local function check_outputs_root_hash(root_hash, hashes)
     local z = string.rep("\0", 32)
     if #hashes == 0 then hashes = { z } end
-    for _ = 1, 16 do
+    for _ = 1, 63 do
         local parent_output_hashes = {}
         local child = 1
         local parent = 1

tests/lua/cmio-test.lua

@@ -193,7 +193,7 @@ end
 local function check_outputs_root_hash(root_hash, output_hashes)
     local z = string.rep("\0", 32)
     if #output_hashes == 0 then output_hashes = { z } end
-    for _ = 1, 16 do
+    for _ = 1, 63 do
         local parent_output_hashes = {}
         local child = 1
         local parent = 1
@@ -271,11 +271,11 @@ for _, dapp in pairs({ "ioctl", "http" }) do
     local suffix = "-" .. dapp
     local desc = " (" .. machine_type .. "," .. dapp .. ")"
     do_test(
-        "merkle tree state must match and reset for each advance" .. desc,
+        "merkle tree state must match and not reset for each advance" .. desc,
         "advance-state-machine" .. suffix,
         function(machine)
+            local hashes = {}
             for _ = 1, 2 do
-                local hashes = {}
                 setup_advance(machine, test_data.valid_advance)
 
                 -- 2 vouchers