Sample example using valve module, flush All Queues and seek feature

[SatwikSShanbhag]

IMPORTANT: All PRs must be linked to an issue (except for extremely trivial and straightforward changes).

Fixes #233

Description
PR contains two samples which uses three features of main Apra Pipes

1. valve Module
2. flush all queues
3. seek

Sample 1. creates Thumbnail using Valve module.
The pipeline reads MP4 video using Mp4ReaderSource Module and sends H264 encoded frames to H264Decoder Module then it send YUV420 encoded frames to valve module from valve module it take only one frame (1st frame) and send it to ColorConversion module where YUV420 frame gets converted to RGB raw frame then its sent to JPEGEncoderNVJPEG to covert it to jpg image and then sent to FileWriterModule to write the file.

Sample 2. start video from beginning using flush all queues and seek features
The pipeline reads MP4 video using Mp4ReaderSource Module and sends H264 encoded frames to H264Decoder Module then it send YUV420 encoded frames to ColorConversion module where YUV420 frame gets converted to RGB raw frame and then given to ImageViewerModule to render on screen after starting pipeline I am calling flushAllQueuesAndSeek function to restart video from beginning.

Precise description of the changes in this pull request

Alternative(s) considered

Have you considered any alternatives? And if so, why have you chosen the approach in this PR?

Type

Other

Screenshots (if applicable)

Checklist

• I have read the Contribution Guidelines
• I have written Unit Tests
• I have discussed my proposed solution with code owners in the linked issue(s) and we have agreed upon the general approach

[mraduldubey]

merge here first: https://github.com/AdityaKBhadragond14/ApraPipes/tree/ab/timelapse_sample and push in same repo.