[djed-sdk] Implement support for Djed Isis and Tefnut variants

[DeveloperAmrit]

Description
Currently, djed-sdk supports the Osiris variant of the Djed protocol. We need to extend the SDK to support the new Djed Isis and Djed Tefnut variants to support the upcoming generalized stablecoin platform.

Requirements

• Add ABIs and contract interaction logic for Djed Isis.
• Add ABIs and contract interaction logic for Djed Tefnut.
• Add support for new oracle integrations:
  • Orb oracles
  • Chainlink oracles
  • HebeSwap oracles
• Ensure djed-sdk exports these new classes/helpers clearly so they can be consumed by StablePay.

Context
The SDK must support these new variants to enable the creation of stablecoins backed by arbitrary assets.