[SDK] Integrate `shannon-sdk` w/ Grove's portal gateway

[Olshansk]

Objective

Integrate shannon-sdk into portal-middleware

Origin Document

• The first independent iteration of the shannon-sdk is available here: https://github.com/pokt-network/shannon-sdk/pull/1
• It's first usage in poktroll is found here: https://github.com/pokt-network/poktroll/pull/554
• The first ieration of the documentation can be found here: https://dev.poktroll.com/develop/packages/sdk
• The first integration of shannon into portal-middleware can be found here: https://github.com/pokt-foundation/portal-middleware/pull/603

Goals

• Collect feedback on the new design of the Shannon SDK
• Put the foundation in place for future iterations towards Shannon

Deliverables

• [ ] Update https://github.com/pokt-foundation/portal-middleware/pull/603 using shannon-sdk
• [ ] Test an E2E Relay

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.

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