Add delegation information for validators endpoint: delegation outputs (Nova) [medium]

[begonaalvarezd]

Description

Priority: medium

This is part 1 of 2 of a feature we need for delegation information for validators/stakers. The idea of this endpoint is to provide the list of delegation outputs a staker has referecencing to it.
It would be nice, if possible, adding to the paginated response the total number of outputs so we know how much to expect without exhausting the cursor.

• URL: /api/explorer/v3/delegation/by-address/[bech32address]
• Response: {"outputIds": string[]}
• Reponse example:

     {"outputIds": [ 0xbe3dc84501b369aa61780e784712df33aad11362ce9aca41749b23e65efdf406382300000500, 0x2ce1ab7feb616fb1ecda46c62368e19e18aacee25fb5467d8a2c846cffd3133adf6300000000]}
  

The 2 parts are:

1. delegation outputs
2. delegators

Motivation

Provide delegation information for validators

Requirements

Open questions (optional)

Are you planning to do it yourself in a pull request?

No.

[begonaalvarezd]

Not needed, provided by indexer already