[SDK] Add REST Support

[Olshansk]

Objective

Add support for REST requests in the poktroll repo so we can enable LLM relays.

Origin Document

• [Infra] Add support for an LLM service in LocalNet/DevNet infra #130
• [LocalNet] Add infrastructure to run LLM inference #508 (comment)

Goals

• Add REST support in the existing packages
• Enable LLM relays to flow through the network
• Refactor/cleanup / document things (if needed) to prepare for other rpc_types

Deliverables

• Implement REST support
• Document REST support (update docusarus)
• Turn on LLM relays
• Add an E2E test for an LLM relay

Non-goals / Non-deliverables

• Adding support for all RPC types
• Handling all error edge cases exhaustively

General deliverables

• Comments: Add/update TODOs and comments alongside the source code so it is easier to follow.
• Testing: Add new tests (unit and/or E2E) to the test suite.
• Makefile: Add new targets to the Makefile to make the new functionality easier to use.
• Documentation: Update architectural or development READMEs; use mermaid diagrams where appropriate.

---

Creator: @Olshansk
Co-Owners: @red-0ne

[red-0ne]

Closed with #594