Small BQ audit optimization

[Tang8330]

Instead of calling .Rows() which will iterate over the in-memory database and append rows for which we just call len() on, we can call NumberOfRows which will return us the number of rows and skip the intermediary object.

Code ref:

transfer/lib/optimization/table_data.go

Lines 168 to 193 in 91fa452

	func (t *TableData) Rows() []map[string]any {
	var rows []map[string]any
	if t.Mode() == config.History {
	// History mode, the data is stored under `rows`
	rows = append(rows, t.rows...)
	} else {
	for _, row := range t.rowsData {
	rows = append(rows, row)
	}
	}
	return rows
	}
	func (t *TableData) NumberOfRows() uint {
	if t == nil {
	return 0
	}
	if t.mode == config.History {
	return uint(len(t.rows))
	}
	return uint(len(t.rowsData))
	}