How to remove old session instead of saving in user storage for long time

### Your use case

#### What would you like to do?
function to remove old session

#### Why would you like to do it?
because it growth storage user memory

#### How would you like to achieve it?
If matrix can do automatically remove the old session if no long use.

### Have you considered any alternatives?

_No response_

### Additional context

_No response_

The issue does not name any files, tests, or entry points. Start by locating how Element Android stores and expires Matrix sessions, then define the inactivity rule and verify that old sessions are removed without affecting actively used sessions.

Written by the indexing model from the issue text.