Update DbTriggerParams and EF Core package versions

- Changed DbTriggerParams to use ICollection<string> for flexibility.
- Updated Microsoft.EntityFrameworkCore.SqlServer to version 9.0.6.
- Made _logger in EGDbContext nullable and optional in constructor.
- Updated logging statements to prevent null reference exceptions.
- Added Microsoft.EntityFrameworkCore.SqlServer package for net8.0 and net9.0.
- Introduced appsettings.migration.json for connection strings and trigger parameters.
- Added EGDbContextFactory for design-time DbContext creation.

EnvelopeGenerator.Infrastructure/EGDbContext.cs

@@ -59,9 +59,9 @@ public class EGDbContext : DbContext, IUserManagerDbContext, IMailDbContext
 
     private readonly DbTriggerParams _triggers;
 
-    private readonly ILogger<EGDbContext> _logger;
+    private readonly ILogger<EGDbContext>? _logger;
 
-    public EGDbContext(DbContextOptions<EGDbContext> options, IOptions<DbTriggerParams> triggerParamOptions, ILogger<EGDbContext> logger) : base(options)
+    public EGDbContext(DbContextOptions<EGDbContext> options, IOptions<DbTriggerParams> triggerParamOptions, ILogger<EGDbContext>? logger = null) : base(options)
     {
         _triggers = triggerParamOptions.Value;
         _logger = logger;
@@ -151,7 +151,7 @@ public class EGDbContext : DbContext, IUserManagerDbContext, IMailDbContext
             .ForEach(tName =>
             {
                 modelBuilder.Entity<T>().ToTable(tb => tb.HasTrigger(tName));
-                _logger.LogInformation("Trigger '{triggerName}' has been added to the '{entityName}' entity.", tName, typeof(T).Name);
+                _logger?.LogInformation("Trigger '{triggerName}' has been added to the '{entityName}' entity.", tName, typeof(T).Name);
             });
         
         // TODO: call add trigger methods with attributes and reflection