chore: faster font weight detection (#4211)

## Description

Using willReadFrequently option makes it 3-5 times faster

## Steps for reproduction

1. click button
2. expect xyz

## Code Review

- [ ] hi @kof, I need you to do
  - conceptual review (architecture, feature-correctness)
  - detailed review (read every line)
  - test it on preview

## Before requesting a review

- [ ] made a self-review
- [ ] added inline comments where things may be not obvious (the "why",
not "what")

## Before merging

- [ ] tested locally and on preview environment (preview dev login:
5de6)
- [ ] updated [test
cases](https://github.com/webstudio-is/webstudio/blob/main/apps/builder/docs/test-cases.md)
document
- [ ] added tests
- [ ] if any new env variables are added, added them to `.env` file

Author: kof

apps/builder/app/canvas/shared/font-weight-support.ts

@@ -18,7 +18,7 @@ const testFontWeights = (fontFamily: string) => {
   const canvas = document.createElement("canvas");
   canvas.width = 200;
   canvas.height = 20;
-  const context = canvas.getContext("2d");
+  const context = canvas.getContext("2d", { willReadFrequently: true });
   const supportedWeights: Array<FontWeight> = ["400"];
 
   if (context === null) {