Add scripts for importing prices and sale contract fees; update purchase fees script

- Implemented `import_prices.py` to import price index values from a CSV file with migration mapping.
- Created `import_sale_fees.py` for importing sale contract line fees, including detailed logging and error handling.
- Modified `import_purchase_fees.py` to change fee type from 'ordered' to 'budgeted' and added fee ID logging.

Reference Data/python_project/loaders/Purchase_Fees 2.csv

@@ -0,0 +1,24 @@
+contract_number,contract_ref,line_sequence,product,supplier,currency,p_r,mode,price,unit
+1926,24997AB,1,Maritime Freight,ODFJELL TANKERS AS,USD,PAY,Per qt,2.25,MT
+1926,24997AB,1,Inspection,INSPECTORATE (SUISSE) SA,USD,PAY,Per qt,0.65,MT
+1926,24997AB,1,Finance,TBD Supplier,USD,PAY,Per qt,0.2,MT
+1926,24997AB,1,Other,FILHET - ALLARD MARITIME,USD,PAY,Per qt,0.06,MT
+1926,24997AB,1,Maritime Freight,ODFJELL TANKERS AS,USD,PAY,Per qt,40,MT
+2109,25030A,1,Address Commission,SU NAVIGATION PTE. LTD,USD,REC,Per qt,0.75,MT
+2109,25030A,1,Demurrage,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,3.8,MT
+2109,25030A,1,P&I charterer's liability,FILHET - ALLARD MARITIME,USD,PAY,Per qt,0.06,MT
+2109,25030A,1,Profit sharing,SUMITOMO CORPORATION - MMC,USD,PAY,Per qt,0.5,MT
+2109,25030A,1,Maritime Freight,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,35,MT
+2109,25030A,1,Finance,UBS SWITZERLAND AG,USD,PAY,Per qt,0.25,MT
+2171,25030D,1,Demurrage,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,3.8,MT
+2171,25030D,1,Finance,TBD Supplier,USD,PAY,Per qt,0.25,MT
+2171,25030D,1,P&I charterer's liability,FILHET - ALLARD MARITIME,USD,PAY,Per qt,0.06,MT
+2171,25030D,1,Profit sharing,SUMITOMO CORPORATION - MMC,USD,PAY,Per qt,0.5,MT
+2171,25030D,1,Address Commission,SU NAVIGATION PTE. LTD,USD,REC,Per qt,0.75,MT
+2171,25030D,1,Maritime Freight,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,35,MT
+2175,25030E,1,Finance,TBD Supplier,USD,PAY,Per qt,0.25,MT
+2175,25030E,1,Maritime Freight,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,35,MT
+2175,25030E,1,Profit sharing,SUMITOMO CORPORATION - MMC,USD,PAY,Per qt,0.5,MT
+2175,25030E,1,Demurrage,SU NAVIGATION PTE. LTD,USD,PAY,Per qt,3.8,MT
+2175,25030E,1,P&I charterer's liability,FILHET - ALLARD MARITIME,USD,PAY,Per qt,0.06,MT
+2175,25030E,1,Address Commission,SU NAVIGATION PTE. LTD,USD,REC,Per qt,0.75,MT