Removing index from segmentation annotation from Pecha parser and serializer

[tentse]

Introduction

As per new design of annotation. We are removing the index from segmentation annotation and only provide the ID and the span information to the user. And we are including the span and ID information when user creates a new pecha.

Design Link: Excalidraw

Task

• Remove index from create_pecha method for segmentation annotation
• Include Span and ID information in response when creating new pecha
• Remove index from pecha_serializer
• Update Test Case
  • Pecha Parser
  • Pecha Serializer
• Fix other failing test case

Reviewer

• @ta4tsering

[tenkus47]

#436 working on the other issue on same branch so this card will be PRed with that issue