refactor: remove SalesInvoiceItemsService and update sales invoice handling

- Deleted SalesInvoiceItemsService as it was not implemented.
- Changed variable declaration from `const` to `let` in SalesInvoicesService for sales invoice creation.
- Updated response handling after sending to TSP provider in SalesInvoicesService.
- Renamed payload properties in TspProvider DTOs for clarity.
- Enhanced error handling in SalesInvoiceTspSwitchService for unsupported providers.
- Refactored SalesInvoiceTspService to utilize utility functions for payload building and sending.
- Updated PrismaService to increase connection limit and utilize dynamic options.
- Added new migration scripts to update database schema for sale_invoice_tsp_attempts.
- Introduced utility functions for building payloads and handling responses in sales invoice processing.

20260507200953_update_sale/migration.sql

@@ -0,0 +1,18 @@
+/*
+  Warnings:
+
+  - Added the required column `raw_request_payload` to the `sale_invoice_tsp_attempts` table without a default value. This is not possible if the table is not empty.
+
+*/
+-- DropForeignKey
+ALTER TABLE `sale_invoice_tsp_attempts` DROP FOREIGN KEY `sale_invoice_tsp_attempts_invoice_id_fkey`;
+
+-- DropIndex
+DROP INDEX `sale_invoice_tsp_attempts_invoice_id_key` ON `sale_invoice_tsp_attempts`;
+
+-- AlterTable
+ALTER TABLE `sale_invoice_tsp_attempts` ADD COLUMN `raw_request_payload` JSON NOT NULL,
+    ADD COLUMN `raw_response_payload` JSON NULL;
+
+-- AddForeignKey
+ALTER TABLE `customer_legal` ADD CONSTRAINT `customer_legal_business_activity_id_fkey` FOREIGN KEY (`business_activity_id`) REFERENCES `business_activities`(`id`) ON DELETE RESTRICT ON UPDATE CASCADE;