feat: introduce robin client

[marcelosousa]

Description

This pull request replaces the interface to interact with Robin from a Golang library to a gRPC client.

Related issue

Closes #770.

Type of change

New feature (non-breaking change which adds functionality)

Checklist

• I have performed a self-review of my code
• I have ran task check -f and have no issues

Code review and merge strategy (ship/show/ask)

Show: this pull request can be auto-merged and a code review should be done post-merge

[reviewpad-stage]

Reviewpad Report

ℹ️ Messages

• If you are adding or updating a built-in, please do not forget to update the docs

[reviewpad-stage]

The changes include adding a new service called "robin" in the Aladino plugin, and a corresponding client to interact with it. The first patch adds new code to support this service, while the second patch removes some lines that were previously used to post comments of the reply of the prompt.

It's hard to say whether these changes are critical without additional context on the functionality and importance of the "robin" service. However, based on the commit messages, these changes seem like additions and updates rather than critical fixes.