configurable stack and heap memory size (#288)

- Allow configuration of the maximum heap and stack size via CLI flags
and JSON input settings.
- Increase the default value for the stack size to 32kb.

---------

Signed-off-by: Cyrill Leutwiler <bigcyrill@hotmail.com>

crates/solidity/src/process/input.rs

@@ -22,6 +22,8 @@ pub struct Input {
     pub debug_config: revive_llvm_context::DebugConfig,
     /// The extra LLVM arguments give used for manual control.
     pub llvm_arguments: Vec<String>,
+    /// The PVM memory configuration.
+    pub memory_config: revive_llvm_context::MemoryConfig,
 }
 
 impl Input {
@@ -33,6 +35,7 @@ impl Input {
         optimizer_settings: revive_llvm_context::OptimizerSettings,
         debug_config: revive_llvm_context::DebugConfig,
         llvm_arguments: Vec<String>,
+        memory_config: revive_llvm_context::MemoryConfig,
     ) -> Self {
         Self {
             contract,
@@ -41,6 +44,7 @@ impl Input {
             optimizer_settings,
             debug_config,
             llvm_arguments,
+            memory_config,
         }
     }
 }