Support displaying Simplicity scripts

[imaginator]

Feature Request: Add Simplicity Program Display for Taproot Script Path Spends

Description

With the upcoming launch of Simplicity on a public signet (e.g., testnet4 or similar), users will start creating, spending, and testing Simplicity-based transactions. To enhance usability and accessibility, the Esplora block explorer should support displaying Simplicity-specific details for transaction inputs that spend Taproot outputs via a Simplicity script path.

When viewing such an input, add a new, clearly labeled section in the input details panel. This section could include:

• Heading: "Simplicity Program" (to distinguish it from standard Bitcoin Script).
• Human-Readable Disassembly: A decoded, readable representation of the executed Simplicity program (e.g., bitcode parsing showing jets in use).
• Tagged Merkle Root (TMR): The TMR as the unique contract identifier.
• Optional Enhancements: MAST visualization if applicable, to show the program's structure.

This feature should be enabled for Simplicity-supported networks like Liquid (where P2TR Simplicity spends are already possible) and the new signet/testnet.

Implementation Notes

• implementation on liquid.network for testing and stability, then extend to Bitcoin testnets/signets.
• Reference for Simplicity details: Ongoing work on transaction weight computation and jet costs; potential future upgrades may involve Taproot script versioning.
• Additional context and examples: Gist on Simplicity Testnet Plans
• here's an example transaction: 6e8d14e02b4255da8b2e0625be120207cc73b378e0edcafffd29f69d199cac70

[philippem]

We've taken a first step at addressing this as
#602

Here is an example transaction with simplicity inputs:
https://blockstream.info/liquid/tx/9d968310e55172871182cfc6fd33a5e2bc5c8ba8fc1f7c4ef5743163ac8b998a?expand

and the display of inputs: