Backend: Implement `MonitorHistoricalReader` methods

[aldy505]

semyi/backend/monitor_historical_reader.go

Lines 16 to 31 in 6a6a53b

	func (r *MonitorHistoricalReader) ReadRawHistorical(ctx context.Context, monitorId string) ([]MonitorHistorical, error) {
	panic("TODO: implement me!")
	}
	func (r *MonitorHistoricalReader) ReadHourlyHistorical(ctx context.Context, monitorId string) ([]MonitorHistorical, error) {
	panic("TODO: implement me!")
	}
	func (r *MonitorHistoricalReader) ReadDailyHistorical(ctx context.Context, monitorId string) ([]MonitorHistorical, error) {
	panic("TODO: implement me!")
	}
	func (r *MonitorHistoricalReader) ReadRawLatest(ctx context.Context, monitorId string) (MonitorHistorical, error) {
	// Get the latest entry from the raw historical table
	panic("TODO: implement me!")
	}

Implement those. The schema is here https://github.com/teknologi-umum/semyi/blob/refactor/backend-duckdb/backend/migrations/20240523085502_monitor_historical.sql