Server side session management using the SQLite (per session) database

Hi Dave/team,

As discussed, I have implemented the server side session management using the SQLite database.

Implementation:

* It creates/reuses the sqlite database per session.

* Stores the key (as text)/value (as blob) in the sqlite database.

* Needs to provide the session directory, where you want to store those sessions. If this directory does not exist, it creates the directory with 700 permission. (Default: <USER_HOME>/.pgadmin/sessions directory.)

* Also - sets default value for the log file to be stored in the '<USER_HOME>/.pgadmin' directory. This will allow us to keep separate configuration per user on any operation system, when running through runtime.

This implementation uses sqlite as session storage, it may affect because of explicit file system I/O operation. Though - performance should not be a big issue, as we're not targeting to support very huge parallel sessions.

Murtuza,

Can you please take a look at it, and do the needful to make it work on Python 3.x?