Get the system-signing info

Request

• Base URL
  https://docs.ripple.com (the document declares no server; this is the origin it was published from)
• Auth
  HTTP bearer
• TypeScript
  https://skmtc.dev/ripple/apis/ripple-custody-api/docs/v1/system-signing/info/get.ts

  A function with typed inputs. Its response is checked against the schema.