Add transaction type to properties "For Rent" and "For Sale"

[eevan7a9]

Update the Real Estate Properties Model to include a transaction type field to clearly indicate if a property is "For Rent" or "For Sale".

Tasks:

Backend Changes are needed:

• The transactionType field should be of type String.
• It should accept only two values: "sale" and "rent".
• This field should be required.
• Add validation to ensure only sale and rent are accepted as values for the transactionType field.

Propose Schema Change:

const propertySchema = new mongoose.Schema(
  {
    ...
    transactionType: { type: String, enum: ['for_sale', 'for_rent'], required: true },
   ...
  },
  {
    timestamps: true,
  }
);

Frontend Changes are needed.

• Modify the property creation form and edit forms to include a field for selecting transactionType.
• Ensure that users can only select either "Sale" or "Rent".