PR for :emphasis property in issue#520

[imlakshay08]

Description

for #520

This PR introduces support for the :emphasis style within the text rendering functionalities of Scarpe. It enables the italicization of text elements such as em, span, and other applicable tags based on Shoes conventions.

Motivation and Context:

• Feature Enhancement: By incorporating support for the :emphasis style, Scarpe gains the ability to properly italicize text where necessary, improving visual representation and flexibility in text styling.

• Alignment with Specifications: This change aligns Scarpe's text styling capabilities with the expected behavior specified for the :emphasis style in Shoes. It allows for three settings: "normal," "oblique," and "italic," enabling versatile text formatting.

Checklist

• [x] Run tests locally

[noahgibbs]

Looks good. Assuming the tests pass (I expect they will) I'm cool with merging this.