fix(levm): remove consumed gas from environment (#1487)

**Motivation**

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**Description**

<!-- A clear and concise general description of the changes this PR
introduces -->
- We only want to keep track of the consumed gas in the current
callframe. We don't need to keep track of it in the environment.
- This change will allow us to implement accurate behavior related to
gas consumption in XCALL and CREATE opcodes.

Note that the gas consumed by the first callframe will indeed be the gas
consumed by total execution, because the gas consume by child CallFrames
will be added to the "father". (It is not as straightforward but that's
the idea).
This change doesn't fix nor break any test, but will be useful for
following changes

<!-- Link to issues: Resolves #111, Resolves #222 -->

Closes #issue_number

cmd/ef_tests/levm/runner/levm_runner.rs

@@ -94,7 +94,6 @@ pub fn prepare_vm_for_tx(vector: &TestVector, test: &EFTest) -> Result<VM, EFTes
         tx.to.clone(),
         Environment {
             origin: tx.sender,
-            consumed_gas: U256::default(),
             refunded_gas: U256::default(),
             gas_limit: tx.gas_limit,
             block_number: test.env.current_number,

crates/vm/levm/src/environment.rs

@@ -5,7 +5,6 @@ pub struct Environment {
     /// The sender address of the transaction that originated
     /// this execution.
     pub origin: Address,
-    pub consumed_gas: U256,
     pub refunded_gas: U256,
     pub gas_limit: U256,
     pub block_number: U256,
@@ -28,7 +27,6 @@ impl Environment {
     pub fn default_from_address(origin: Address) -> Self {
         Self {
             origin,
-            consumed_gas: U256::zero(),
             refunded_gas: U256::default(),
             gas_limit: U256::MAX,
             block_number: Default::default(),

crates/vm/levm/src/vm.rs

@@ -396,7 +396,6 @@ impl VM {
                             .saturating_sub(current_call_frame.gas_used);
                         current_call_frame.gas_used =
                             current_call_frame.gas_used.saturating_add(left_gas);
-                        self.env.consumed_gas = self.env.consumed_gas.saturating_add(left_gas);
                     }
 
                     self.restore_state(backup_db, backup_substate, backup_refunded_gas);
@@ -1115,11 +1114,6 @@ impl VM {
         }
 
         current_call_frame.gas_used = potential_consumed_gas;
-        self.env.consumed_gas = self
-            .env
-            .consumed_gas
-            .checked_add(gas)
-            .ok_or(OutOfGasError::ConsumedGasOverflow)?;
 
         Ok(())
     }