Add a precompile workload

src/Quasar.jl

@@ -1819,4 +1819,6 @@ function (v::AbstractVisitor)(program_expr::QasmExpression)
     return v
 end
 
+include("precompile.jl")
+
 end

src/precompile.jl

@@ -0,0 +1,35 @@
+@setup_workload begin
+    # Putting some things in `setup` can reduce the size of the
+    # precompile file and potentially make loading faster.
+    using Quasar
+    @compile_workload begin
+        # all calls in this block will be precompiled, regardless of whether
+        # they belong to your package or not (on Julia 1.8 and higher)
+        qasm_src = """OPENQASM 3.0;
+                   gate h a { U(π/2, 0, π) a; gphase(-π/4);};
+                   gate x a { U(π, 0, π) a; gphase(-π/2);};
+                   gate cx a, b { ctrl @ x a, b; };
+
+                   def bell(qubit q0, qubit q1) {
+                       h q0;
+                       cx q0, q1;
+                   }
+                   qubit[2] q;
+                   bell(q[0], q[1]);
+                   bit[2] b = "00";
+                   b[0] = measure q[0];
+                   b[1] = measure q[1];
+
+                   bell(q[0], q[1]);
+                   int xx = 1;
+                   xx = 3;
+                   """
+        parsed = Quasar.parse_qasm(qasm_src)
+        Quasar.dt_type[] = Quasar.Nanosecond
+        Quasar.builtin_gates[] = Quasar.basic_builtin_gates
+        Quasar.visit_pragma[]  = Quasar.basic_visit_pragma
+        Quasar.parse_pragma[]  = Quasar.basic_parse_pragma
+        visitor = Quasar.QasmProgramVisitor()
+        visitor(parsed);
+    end
+end