Fix memory issue in PriorityQueue Slice method

[Gentleelephant]

Motivation

• Fixes potential memory retention issue in PriorityQueue Slice method.
• In Go, slices share the same underlying memory block. This means that even if we are only interested in a small subset of the data, the entire array is kept in memory. In scenarios with unbounded streams, this could result in significant memory not being reclaimed.

Modifications

• Updated the Slice method to create a new slice and copy the relevant elements.
• This change ensures better memory management without altering the method’s functionality.

Verify change

• Make sure the change passes the CI checks.

[reugn]

@Gentleelephant, thanks for bringing this up. While reviewing the pull request, I have discovered more issues in the sliding window implementation. Therefore, it has been decided to refactor and entirely remove the use of the priority queue from the component. See #137.