ccextractor: Copy over timecode meta from the input buffers to the outgoing caption buffers

Formats like SCC and MCC work based on timecodes so ideally we pass
through the timecodes when writing them.
4 jobs for ccextractor-framerate in 9 minutes and 21 seconds (queued for 41 seconds)
Status Job ID Name Coverage
  Preparation
passed #57888
gst indent

00:00:32

passed #57887
manifest

00:00:20

 
  Build
passed #57889
build fedora x86_64

00:04:04

 
  Full Builds
passed #57890
build android arm64 api28

00:04:23