Add Indexes to FoodDonation tables

The tables around Food Donations need to be reviewed and we need to ensure that they have proper indexes and that queries against them are not doing Table Scans.

I am seeing that tbTransactionFoodDonation has no indexes at all (should at least have a PK) and tbFoodDonationItem has a PK, but since we are joining on ItemID and SalesItemID in qry_MMS_XSLT_FoodDonations, we probably need indexes on those 2 columns at least.

Please review all the queries against these tables and ensure that they are using decent indexes.