Revive block explorer

[rpanic]

Currently the old block explorer has vanished from the main branch mysteriously. In the future however, we want a modular and reusable block explorer for protokit.

We can either:

• Revive the old block explorer, update it and expand it with the new features See https://github.com/proto-kit/framework/commit/09a32f756cf9b30a555463358da37536c9c25b0a
• Revive one of the block explorer developed during previous hackathons by community members https://github.com/satyambnsal/ProtoScope
• Start from scratch