[Prio] Addition: Hook Explainer frame: also on Sign Request

[WietseWind]

Currently, the Hook Explainer Frame opens on:

• Hook enabled network
• Event list tx details
• HookSet tx

As all transactions can now involve Hook execution, it should display on ALL transactions (because there could be an outgoing Hook involved) on networks with Hooks enabled.

At first I only thought to add it to Invoke TX and anything With Hook params, but it can actually be ANY tx. So let's ALWAYS show it right before the slide button. The frame will be 0px height on by default and the inner frame will scale/size it with the existing logic to resize the webview.

[N3TC4T]

Added b75ed5c

Note: as we use the hook explainer in different part of the app, I included a field called origin to the post data to the explainer endpoint.

Possible values is TransactionDetails and ReviewPayload indicating that HookExplainer is being displayed in the transaction details or in the review transaction before signing.