The Massachusetts House has tapped former attorney general Martha Coakley and two other lawyers to help with a “comprehensive” review of its sexual harassment policies, according to an email its top in-house counsel sent to lawmakers.The addition of Coakley, now with the firm Foley Hoag, comes after Speaker of the House Robert DeLeo filed an order in late October launching the review amid a wave of sexual harassment reports — both in the State House and nationwide.