Add base endpoints to API proxy and configure Status go to use these end points

[shivekkhurana]

Feature Issue

User Story

As a developer, I want to access Base chain via RPC so that I can do chain related tasks like fetching quotes, token balances etc.

Description

Given the Base end points from the other issue, integrate Base at the proxy level and status-go level.

Acceptance Criteria

• [ ] API proxy has Base end point
• [ ] Status Go is configured to use this end point

Notes

• [ ] TODO: Create a status-go issue to track this