[Feature Request] Add Search and Count Features to the Observable Tracker Window

[ElecIon]

Summary:
The Observable Tracker window offers powerful tracking data capabilities but lacks built-in search and count functionalities. This can make it difficult for users to quickly make judgments and locate issues when dealing with large volumes of data. If there are existing features or discussions similar to this within the project, please provide links or relevant information.

Feature Description:
Count Feature: Display the total number of entries. In some cases, it can be visually helpful to judge memory leaks through the total count.
Search Feature: Users input a keyword into the Observable Tracker window, and the window will display all entries whose names or stack traces contain that keyword. This can assist users in better pinpointing the source of issues.

Appreciation:
The Observable Tracker is a very powerful tool, and I believe these features will greatly enhance the usability and user experience of the Observable Tracker window.
Thank you to the maintainers and community members for considering this feature request.