Update MetadataJson.js

[devkumar2313]

Added download Json button.

1. Download Button: A new button with an onClick handler for downloading the JSON file has been added next to the "Copy to Clipboard" button.
2. handleDownload Function: This function creates a blob from the JSON string, creates a temporary anchor element, and programmatically clicks it to trigger the download. The filename is set to the current Unix timestamp.
3. After the download is triggered, the temporary URL and anchor element are cleaned up to avoid memory leaks.

• [x] Add a 'Download JSON' button to the right of the 'Copy to Clipboard' button inside the Metadatajson.js component (path: src/components/Body/CreateNft/MetadataJson.js).
• [x] Attach an on-click handler to the download button that:
  • [x]Creates a .json file with a filename based on the Unix timestamp when the user clicks the 'Download JSON' button (e.g., 1697743200.json).
  • [x]Places the NFT metadata's JSON object inside the .json file and initiates the download.

Thanks for considering...

[bhupendra-chouhan]

Awesome Work @devkumar2313 👏

[bhupendra-chouhan]

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