feat: switch solar_project to use cache (#11481)

Author: DaniPopes

Cargo.lock

@@ -113,6 +113,7 @@ solar-ast.opt-level = 3
 solar-data-structures.opt-level = 3
 solar-interface.opt-level = 3
 solar-parse.opt-level = 3
+solar-sema.opt-level = 3
 
 # EVM.
 alloy-dyn-abi.opt-level = 3
@@ -204,7 +205,7 @@ foundry-linking = { path = "crates/linking" }
 
 # solc & compilation utilities
 foundry-block-explorers = { version = "0.21.0", default-features = false }
-foundry-compilers = { version = "0.19.0", default-features = false }
+foundry-compilers = { version = "0.19.1", default-features = false }
 foundry-fork-db = "0.18"
 solang-parser = { version = "=0.3.9", package = "foundry-solang-parser" }
 solar = { package = "solar-compiler", version = "=0.1.6", default-features = false }

Cargo.toml

@@ -957,9 +957,11 @@ impl Config {
         self.create_project(false, true)
     }
 
-    /// Same as [`Self::ephemeral_project()`] but configures the project to not emit any artifacts.
+    /// A cached, in-memory project that does not request any artifacts.
+    ///
+    /// Use this when you just want the source graph or the Solar compiler context.
     pub fn solar_project(&self) -> Result<Project<MultiCompiler>, SolcError> {
-        let mut project = self.ephemeral_project()?;
+        let mut project = self.project()?;
         project.update_output_selection(|selection| {
             *selection = OutputSelection::common_output_selection([]);
         });