Optimize readBytes method to use ByteBuffer bulk operations

[SamareshSingh]

Summary

Replace inefficient byte-by-byte loop with ByteBuffer's bulk get() method for better performance.

Changes

• Uses buffer.get(bytes) to read all bytes at once (much faster)
• Properly saves and restores the buffer position to maintain state
• Removes the TODO comment as the optimization is now implemented

Performance Benefits

• Eliminates loop overhead (no iteration variable updates)
• Uses native bulk copy operations (typically System.arraycopy under the hood)
• Reduces method calls from O(n) to O(1)
• Better CPU cache utilization

Implementation Details

The try-finally block ensures the buffer's position is always restored even if an exception occurs during the read operation.

Resolves

• TODO at line 101 in Utils.scala