Add transport context to enrichSettleResponse

[phdargen]

Description

Adds additional transport context to enrichPaymentRequiredResponse (request ctx) and enrichSettleResponse (request ctx + response ctx) hooks (#1003) allowing extensions to append transport specific data such as a signed request/responseBody discussed in #1024.

Example usage:

  enrichSettlementResponse: async (
    _declaration: unknown,
    context: SettleResultContext,
  ): Promise<unknown> => {
    const httpData = context.transportContext as HTTPTransportContext | undefined;

    return {
      request: {
        path: httpData.request.path,
        method: httpData.request.method,
      },
      responseBody: httpData.responseBody?.toString("utf-8"),
    };
  }

with Payment response:

{
  "success": true,
  "transaction": "0x...",
  "network": "eip155:84532",
  "payer": "0x...",
  "extensions": {
    "transport-context-test": {
      "request": {
        "path": "/weather",
        "method": "GET"
      },
      "responseBody": "{\"report\":{\"weather\":\"sunny\",\"temperature\":70}}"
    }
  }
}

Checklist

• I have formatted and linted my code
• All new and existing tests pass
• My commits are signed (required for merge) -- you may need to rebase if you initially pushed unsigned commits
• I added a changelog fragment for user-facing changes (docs-only changes can skip)

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[vercel]

@phdargen is attempting to deploy a commit to the Coinbase Team on Vercel.

A member of the Team first needs to authorize it.