[fix] - Add Size Method to BufferedReadSeeker and Refactor Context Timeout Handling in HandleFile

[ahrav]

Description:

This PR enhances the BufferedReadSeeker with a new Size method for determining the total size of the reader and improves the HandleFile function by centralizing context timeout management.

Changes:

1. Introduce Size Method to BufferedReadSeeker:

   • Functionality:
     Added a Size method that efficiently retrieves the total size of the underlying reader for both seekable and non-seekable sources by utilizing the existing Seek method.

2. Refactor Context Timeout Handling in HandleFile:

   • Change:
     Moved the creation and management of the context timeout (processingCtx) outside of each handler within the HandleFile function.
   • Benefit:
     Allows context timeouts to be propagated back to the caller, enabling better external handling and monitoring of timeout events.

Checklist:

• Tests passing (make test-community)?
• Lint passing (make lint this requires golangci-lint)?