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Add typescript support.
Just a index.d.ts file so when the library is imported in a typescript project it will not have the error
"Could not find a declaration file for module 'sqlutils/pg'.
'path/to/folder/node_modules/sqlutils/pg/index.js' implicity has any type."
I had doubts about the Transformation function return type, so I suggest checking if it's correct before merging.