Savory Barley Soup with Wild Mushrooms and Thyme

1/2 oz. dried porcini mushrooms 

1/2 cup dry white wine 

1 Tbs. olive oil 

1/2 cup chopped shallots 

2 garlic cloves, minced 

8 oz. cremini mushrooms, chopped 

1 tsp. minced fresh thyme or 1/2 tsp. dried 

1/4 tsp. salt, plus more, to taste 

1/4 tsp. freshly ground pepper, plus more, to taste  

3 cups chicken broth 

3/4 cup pearl barley 

1 Tbs. tomato paste 

3 cups water 

2 tsp. fresh lemon juice