Add teal icon

[ArshvirGoraya]

Description

• Adds teal icon to the core set.

Requirements / Checklist

• Read the Contributing Guidelines
• I've discussed this with core contributors already. If not checked, I'm ready to accept this work might be rejected in favor of a different grand plan.
  Issue number where discussion took place: #xxx
• If this contains a font/glyph add its origin as background info below (e.g. URL)
• Verified the license of any newly added font, glyph, or glyph set. License is: xxx
  • If this refers to the original icon, I assume the icon is under the same MIT license as the teal project itself, but I could not find any official verification that the icon is also under this license.
  • If this refers to the SVG added, I did create it.

What does this Pull Request (PR) do?

• Adds teal icon to the core set.

How should this be manually tested?

• N/A

Any background context you can provide?

• Teal is a statically-typed dialect of the Lua programming language. It is to Lua what Typescript is to Javascript.
• As of the making of this PR, the official svg from the teal website is this:

• I recreated it for a smaller file size and used the existing lua svg as the starting point.
• Fill color:
  • I'm not sure what the standard is for the fill color: If it should just be black/white, colored, or if it even matters.
  • The official teal icon has a color gradient, but the fill color used in this SVG is the one used for the teal icon within the vscode-material-icon-theme (#00acc1) because it looked the best to me (after comparing it with the dominant color of the official color gradient (#00a2ad), and the 2 colors used in the official gradient (#007b85, #00cdd9)).

What are the relevant tickets (if any)?

• N/A

Screenshots (if appropriate or helpful)

The screenshots underneath were created after manually adding the teal icon into CaskaydiaMonoNerdFontMono-Regular.ttf using FontForge at a Private Use Area slot:

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In Terminal:

In Nvim: