feat: use FileSystemFileHandle to modify a file on the local filesystem (#965)

## Launch Checklist

<!-- Thanks for the PR! Feel free to add or remove items from the
checklist. -->


 - [x] Briefly describe the changes in this PR.
 - [x] Link to related issues.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [ ] Write tests for all new functionality.
 - [x] Add an entry to `CHANGELOG.md` under the `## main` section.

## Changes

- This pull request makes use of the FileSystemFileHandle API to modify
a local file. No need to download it - just click save.
- I don't know how to cover this functionality by tests so I need
directions in case test coverage is required.
- The pull request adds
[@types/wicg-file-system-access](https://www.npmjs.com/package/@types/wicg-file-system-access)
as a new dev dependency which I am not really pleased about but can't
think of a way around it.

## Known Limitations

- The used File API is only available in when accessed from https or on
localhost.
- There is no visual indicator that the file has been saved. Previously
the browser showed it as a new download.

## Issue

- https://github.com/maplibre/maputnik/issues/964

## Screenshots

### Menu
<img
src="https://github.com/user-attachments/assets/dfcfc5c2-0019-4857-ba26-224b5598fc11"
/>

### Open modal
<img
src="https://github.com/user-attachments/assets/4e1293e8-16b6-4b86-925b-3bebb49d8ca6"
height="200px" />

### Save modal
<img
src="https://github.com/user-attachments/assets/4f10e2c0-2dd3-4726-a613-30e0406619b0"
height="200px" />

---------

Co-authored-by: Harel M <harel.mazor@gmail.com>

package-lock.json

@@ -94,6 +94,7 @@
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         "@types/string-hash": "^1.1.3",
         "@types/uuid": "^9.0.8",
+        "@types/wicg-file-system-access": "^2023.10.5",
         "@vitejs/plugin-react": "^4.2.1",
         "cors": "^2.8.5",
         "cypress": "^13.13.0",
@@ -2395,6 +2396,13 @@
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       "dev": true
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+      "license": "MIT"
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     "node_modules/@types/yauzl": {
       "version": "2.10.3",
       "resolved": "https://registry.npmjs.org/@types/yauzl/-/yauzl-2.10.3.tgz",