Upgrading to v5

v5 modernizes the library. What changed for callers:

• Target frameworks: .NET 8, 9, 10 and 11. .NET 6 and 7 (out of support) are dropped.

• Async only: Start(), Stop() and Dispose() are removed. Use await StartAsync(), await StopAsync() and await using. PgServer implements IAsyncDisposable only.

• Options object: the long constructor is replaced by new PgServer(pgVersion) and new PgServer(PgServerOptions). The parameters map to option properties of the same name:

  v4 parameter	v5 option
  startupWaitTime (ms)	StartupTimeout (TimeSpan)
  pgServerParams	ServerParams
  pgExtensions	Extensions
  deleteFolderRetryCount	DeleteFolderRetryCount
  deleteFolderInitialTimeout (ms)	DeleteFolderInitialDelay (TimeSpan)
  deleteFolderTimeoutFactor	gone: the delay always doubles

• Instance cleanup: instances without an InstanceId are now deleted on stop by default. Set ClearInstanceDirOnStop = false to keep them.

• Folder layout: binaries now live in a shared install folder under BinariesDir, so PgBinDir points there instead of <instance>/bin. Existing named instances keep their data.

• Removed: PgExtensionConfig.CreateExtensionSqlList (it was never executed). Run CREATE EXTENSION yourself.

• Errors: failures are reported as PostgresEmbedException, and startup errors include the end of the server log.

• New: ConnectionString, IsRunning, LogFile, InstallDir, CancellationToken support, logging, proxy support through HttpClient, Linux arm64 and Alpine support, and support for paths with spaces and non-ASCII characters.