Expose fileSize variable in File picker component

[GrowwithNaveen]

Problem Description
Currently, the File Picker component lacks the ability to expose the size of the selected file(s) after selection. This makes it difficult for users to:

1. Validate file size before upload: Users might unintentionally choose files exceeding size limitations on servers or storage.
2. Display file size information: Users have no way to see the size of the chosen file(s) within the application itself.

Solution (To be finalized)

1. Expose File Size as a Variable: Introduce a new variable fileSize within the File Picker component that exposes the size of the selected file(s) in bytes. This variable could be accessed through the component properties panel or programmatically within event handlers.
2. Display File Size in UI: Optionally, implement a way to display the file size directly within the File Picker UI. This could be achieved by adding a text element next to the filename that dynamically updates based on the selected file. Users can choose to enable/disable this feature in the component settings.