fix(wasm): Move Runner struct to shared file

internal/ext/wasm/nowasm.go

@@ -3,17 +3,12 @@
 package wasm
 
 import (
-	"fmt"
 	"context"
+	"fmt"
 
 	"github.com/sqlc-dev/sqlc/internal/plugin"
 )
 
-type Runner struct {
-	URL    string
-	SHA256 string
-}
-
 func (r *Runner) Generate(ctx context.Context, req *plugin.CodeGenRequest) (*plugin.CodeGenResponse, error) {
 	return nil, fmt.Errorf("sqlc built without wasmtime support")
 }

internal/ext/wasm/runner.go

@@ -0,0 +1,7 @@
+package wasm
+
+type Runner struct {
+	URL    string
+	SHA256 string
+	Env    []string
+}

internal/ext/wasm/wasm.go

@@ -44,12 +44,6 @@ func cacheDir() (string, error) {
 	return filepath.Join(cacheHome, "sqlc"), nil
 }
 
-type Runner struct {
-	URL    string
-	SHA256 string
-	Env    []string
-}
-
 var flight singleflight.Group
 
 // Verify the provided sha256 is valid.