fix: replace foreign Meta.eval with primitive and suppress compile errors in wrenCompile

test/meta/eval_compile_error.wren

@@ -0,0 +1 @@
+Meta.eval("!!") // expect runtime error: Could not compile source code.

test/meta/eval_not_string.wren

@@ -0,0 +1 @@
+Meta.eval(123) // expect runtime error: Source code must be a string.