Get Dilution Rating for a given ticker. Supports filtering by rating fields (offering_ability, dilution, offering_frequency, cash_need, nasdaq_compliance, overall_offering_risk), regsho status, and numeric range filters for cash_burn (min_cash_burn, max_cash_burn) and cash_remaining_months (min_cash_remaining_months, max_cash_remaining_months). At least one filter (ticker, regsho, a rating filter, or a cash range filter) is required.