feat(hermes): add staked-ada endpoint

[aido-mth]

Description

Creates staked-ada endpoint for voting power tracking.

Related Issue(s)

Closes #499

Description of Changes

• Added gateway configuration for staked-ada endpoint
• Added staked-ada endpoint configuration
• Updated justfile for athena build
• Added utoipa to provide api doc
• Added integration test for staked-ada endpoint

Related Pull Requests

#593 #577 #571

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

📚 Docs Preview

The docs for this PR can be previewed at the following URL:

https://docs.dev.projectcatalyst.io/hermes/aido/499/staked-ada-endpoint

[rafal-ch]

I left a couple of small comments.

I assumed that most of the bussiness-logic code (for example, in get_txo_assets()) has just been copied from gateway, so I didn't check these parts thoroughly.

[cong-or]

lgtm

[rafal-ch]

LGTM 👍
Good stuff.