Feat: Add Reviewpad workflows

[ferreiratiago]

Description

This pull request introduces changes to the Reviewpad configuration, mainly:

• The new workflow sanity, which validates that:
  • When a pull request only changes .py files and has more than 1000 changed lines, it fails the Reviewpad check and asks the developer to split the PR into multiple PRs.
  • When it contains a binary file, it fails the Reviewpad check and asks the developer to remove the binaries from the PR.
• The new workflow dependencies, which validates that:
  • When changing any of the files pyproject.tom or poetry.lock and missing the changes to requirements, it requests for changes to update both requirements.txt and requirements-full.txt.

It also fixes the issue of removing the size label and adding the size label on every Reviewpad run (an issue introduced on #3710).

How has this been tested?

The configuration was tested using Reviewpad playground.

Others

• I have performed a self-review of my own code.
• I have commented my code, particularly in hard-to-understand areas.

[reviewpad]

Reviewpad Report (Reviewpad ran in dry-run mode because configuration has changed)

📜 Executed actions

$removeLabels(["feat S", "feat M", "feat L", "feat XL"])
$addLabel("feat XS")