add support for .Net7 and EF

[teghoz]

SqlException: Execution Timeout Expired. The timeout period elapsed prior to completion of the operation or the server is not responding.
Microsoft.Data.SqlClient.SqlConnection.OnError(SqlException exception, bool breakConnection, Action<Action> wrapCloseInAction)
Microsoft.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, bool breakConnection, Action<Action> wrapCloseInAction)
Microsoft.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, bool callerHasConnectionLock, bool asyncClose)
Microsoft.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, out bool dataReady)
Microsoft.Data.SqlClient.SqlDataReader.TryConsumeMetaData()
Microsoft.Data.SqlClient.SqlDataReader.get_MetaData()
Microsoft.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, string resetOptionsString, bool isInternal, bool forDescribeParameterEncryption, bool shouldCacheForAlwaysEncrypted)
Microsoft.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, bool returnStream, bool isAsync, int timeout, out Task task, bool asyncWrite, bool inRetry, SqlDataReader ds, bool describeParameterEncryptionRequest)
Microsoft.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, bool returnStream, TaskCompletionSource<object> completion, int timeout, out Task task, out bool usedCache, bool asyncWrite, bool inRetry, string method)
Microsoft.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, bool returnStream, string method)
Microsoft.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior)
Microsoft.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior)
Microsoft.EntityFrameworkCore.Storage.RelationalCommand.ExecuteReader(RelationalCommandParameterObject parameterObject)
Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable<T>+Enumerator.InitializeReader(Enumerator enumerator)
Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable<T>+Enumerator+<>c.<MoveNext>b__21_0(DbContext _, Enumerator enumerator)
Microsoft.EntityFrameworkCore.SqlServer.Storage.Internal.SqlServerExecutionStrategy.Execute<TState, TResult>(TState state, Func<DbContext, TState, TResult> operation, Func<DbContext, TState, ExecutionResult<TResult>> verifySucceeded)
Microsoft.EntityFrameworkCore.Query.Internal.SingleQueryingEnumerable<T>+Enumerator.MoveNext()
System.Collections.Generic.List<T>..ctor(IEnumerable<T> collection)
System.Linq.Enumerable.ToList<TSource>(IEnumerable<TSource> source)
System.Threading.Tasks.Task<TResult>.InnerInvoke()
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, object state)
System.Threading.ExecutionContext.RunFromThreadPoolDispatchLoop(Thread threadPoolThread, ExecutionContext executionContext, ContextCallback callback, object state)
System.Threading.Tasks.Task.ExecuteWithThreadLocal(ref Task currentTaskSlot, Thread threadPoolThread)
X.PagedList.PagedListExtensions.ToListAsync<T>(IEnumerable<T> superset, CancellationToken cancellationToken)
X.PagedList.PagedListExtensions.ToPagedListAsync<T>(IQueryable<T> superset, int pageNumber, int pageSize, CancellationToken cancellationToken)
X.PagedList.PagedListExtensions.ToPagedListAsync<T>(IQueryable<T> superset, int pageNumber, int pageSize)

After Implementing this fabulous pager. I noticed some performance regressions. Upon studying the internals, I see that when you send in an IQueryable representing a vast dataset. The Count() query can be expensive. So I have added a TotalListCount as an optional parameter if the consumer already has that handy. So the library would only make a paged request to the data source.

I also deprecate Startup.cs on Example Project and Added support for NET7