[explorer] task: Added convert message to utf8 feature

[AnthonyLaw]

What was the issue?

• The explorer transaction message field didn't support the hex string (drop first 0 bytes in message) for UTF-8.

What's the fix?

• Added a button, so the user can switch from the default view to UTF8
• It only supports the non-encrypted message and the payload in hex string.

Screenshoot

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[Wayonb]

Can you fix linting?