feat(cat-gateway): setup_fund cli tool.

[Mr-Leshiy]

Description

Adding a setup_fund.py CLI tool for setup fund related documents and publishing it to the cat-gateway

Related Issue(s)

Closes #3788

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/voices/feat/signed-doc-importer

[apskhem]

LGTM