Precision error fix for decimals on sql server

[shibba-96]

Fixes #720

Summary

• Correctly applying precision of the SQL Server decimal values to destination

Refer to #720 for the full detail on the precision mismatch.

Test plan

• Tested input noted on issue between SQL Server and Snowflake after rebuild via scripts/build.sh and running it with ./sling.
• Able to product identical decimal precision seen on v1.3.4 and current version without column_typing configuration.

create transient table 
"SLING_TEST"."ALL_DTYPES_MSSQL_TMP" ("COL_MONEY" decimal(24,6),
  "COL_DECIMAL" decimal(10,2),
  "COL_DECIMAL2" decimal(28,8),
  "COL_DECIMAL3" decimal(16,8))