[Bugfix] Correct translation rate issue on balance sheet

PR Overview

This PR will address the following Issue/Feature: #75

This PR will result in the following new package version: TBD (we are not releasing this version and will be folding it in with #78 once resolved)

LIkely not breaking as this will fix internal logic on one field but not add/remove any current fields.

Please detail what change(s) this PR introduces and any additional information that should be known during the review of this PR:

Adjusted our translation rate logic to calculate converted_amount in netsuite__balance_sheet and netsuite2__balance_sheet.
- The logic is adjusted so we examine the general_rate_type rather than account_category, as is intended by Netsuite definitions.
- Historical and average rates now convert amounts into the converted_amount_using_transaction_accounting_period. Otherwise, it looks at converted_amount_using_reporting_month.
- The is_leftside logic is added to make sure debit values are properly assigned as negative converted values if false and positive if true.

PR Checklist

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Provided details to @fivetran-jamie privately.

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fivetran / dbt_netsuite