Feat: Allow Keep Buffer Accross ReOpen, Allow Closing File While Waiting, Add ReOpen Backoff Configuration

[EliSauder]

This is useful for cases where a file writer writes part of a line, rotates the file, then writes the rest of the line.

[EliSauder]

Also added the ability to close the file while waiting for modifications. Inspired by both an issue I had on Windows and the PowerShell Get-Content -Wait logic defined here: https://github.com/PowerShell/PowerShell/blob/master/src/System.Management.Automation/namespaces/FileSystemContentStream.cs

Issue I had:
Whenever I would start tailing a log file created by a piece of vendor created software, the log file would stop updating.