fix: get proper binding for the fetch function

[alexjoverm]

Hey team, this issue is important as it makes js-client unusable. The fix is on the binding of fetch which is bound to the instance of the client instead of window. Check this stackoverflow thread for more info: https://stackoverflow.com/questions/44720448/fetch-typeerror-failed-to-execute-fetch-on-window-illegal-invocation

Btw, I know the type any is not ideal but as this is blocking we can improve that later.

Pull request type

• Bugfix

How to test this PR

• Switch to the branch of this PR
• Open one terminal (terminal A) - run npm run build to ensure you're using latest js-client dist
• Open another terminal (terminal B) - run cd playground-svelte, run npm i, and run npm run demo. Open http://localhost:5174/ in the browser and all should be good (as in image 1 below) - ISSUE FIXED
• Now in src/sbFetch line 33, change is as it was before this.fetch = $c.fetch(args) || fetch(args), and in terminal A run npm run build again
• Reload the page on the browser, open the console, and you'll see the fetch function is failing (as in image 2 below) - CURRENT ISSUE

IMAGE 1 - ALL GOOD

IMAGE 2 - FETCH FAILING

[alexjoverm]

Closing in favor of #712