feat: impl faster cost tracker for default cost fns

* add cost calculation checks to replay-block commands
* add prop testing to cost replacements
* apply lints to costs module
* add `CostValues` trait to reduce repetitive code in the default cost calculations.
* add artificial stall to force long-running tx in `tests::nakamoto_integrations::skip_mining_long_tx`

Author: kantai

clarity/src/vm/contexts.rs

@@ -715,6 +715,10 @@ impl<'a, 'hooks> OwnedEnvironment<'a, 'hooks> {
         })
     }
 
+    pub fn is_mainnet(&self) -> bool {
+        self.context.mainnet
+    }
+
     #[cfg(any(test, feature = "testing"))]
     pub fn stx_faucet(&mut self, recipient: &PrincipalData, amount: u128) {
         self.execute_in_env::<_, _, crate::vm::errors::Error>(