Explorer MVP

[naps62]

Create a simple explorer with the following requirements:

• Should focus on anvil nodes
• When necessary, should rely on the ots_* API endpoints (see reference), which provides listing capabilities that are not typically present in an RPC node
• For layout decisions, we should mostly defer to what etherscan does, since that's the familiar layout to everyone already, and to avoid reinventing the wheel
• A top-level input should allow switching the RPC URL
• The current RPC-URL should be encoded as a route component in the URL (important to enable reverse proxies to connect only to specific instances)
• when possible, components from ethui/ethui or ethui/ui should be used or adapted. If the effort is too large, we can defer this to future work