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.

src/modules/tspProviders/dto/provider-switch.dto.ts

@@ -231,12 +231,12 @@ export class TspProviderSendItemResultDto {
   })
   @IsOptional()
   @IsObject()
-  request_payload: Object
+  provider_request_payload: Object
 
   @ApiProperty({ required: false, nullable: true, type: Object })
   @IsOptional()
   @IsObject()
-  response_payload?: unknown
+  provider_response_payload?: Object
 
   @ApiProperty({ required: true })
   @IsBoolean()
@@ -291,7 +291,7 @@ export class TspProviderGetResultDto {
   @ApiProperty({ required: false, nullable: true, type: Object })
   @IsOptional()
   @IsObject()
-  response_payload?: unknown
+  provider_response_payload?: Object
 
   @ApiProperty({ required: true })
   @IsDateString()
@@ -359,12 +359,12 @@ export class TspProviderRevokeResponseDto {
   @ApiProperty({ required: false, nullable: true, type: Object })
   @IsOptional()
   @IsObject()
-  request_payload?: unknown
+  provider_request_payload?: unknown
 
   @ApiProperty({ required: false, nullable: true, type: Object })
   @IsOptional()
   @IsObject()
-  response_payload?: unknown
+  provider_response_payload?: unknown
 
   @ApiProperty({ required: true })
   @IsDateString()