gpui: Add support for text in SVGs

[SethDusek]

Closes #21319
Before:

After:

Use fontdb to load system fonts and pass it to resvg renderer. This adds a small increase in startup time (around 30ms on my Linux system to traverse fonts on a cold start). In the future once cosmic-text bumps their version of fontdb we could clone the Database from CosmicTextSystem

Release Notes:

• Added: support for rendering text in SVGs

[zed-industries-bot]

	Warnings
⚠️	This PR is missing release notes. Please add a "Release Notes" section that describes the change: Release Notes: - Added/Fixed/Improved ... If your change is not user-facing, you can use "N/A" for the entry: Release Notes: - N/A

Generated by 🚫 dangerJS against 2ab99da

[Angelk90]

@SethDusek : It seems to work fine, I did a test with the following svg:

<svg xmlns="http://www.w3.org/2000/svg" width="83" height="20">
    <path
        d="M0,3 C0,1.34 1.35,0 3.0,0 L40,0 L40,20 L3.0,20 C1.35,20 0,18.65 0,17 L0,3 Z"
    />
    <text fill="#00FF00"><tspan x="0" y="14">GR</tspan></text>
    <text fill="#FF0000"><tspan x="20" y="14">RE</tspan></text>
</svg>

When trying the code online, there is no space between the texts, see the Vscode and Online image, what the space appears in the Zed.

Look comment: #21319 (comment)

Vscode:

Zed:

Online: