Add threading Tasks

[RiscadoA]

Description

Utility class which can be used to wait for results which come from asynchronous code. This will be really useful to implement stuff like waiting for a given voxel object to be loaded and meshed, instead of just blocking the entire application. With this we'll able to implement stuff like smooth terrain loading and loading screens.

Since this doesn't really fit in the other existing modules, created a new dir core/thread and also moved the thread pool class there.

Checklist

• [x] Self-review changes.
• [x] Evaluate impact on the documentation.
• [x] Ensure test coverage.
• [x] Add entry to the changelog's unreleased section.

[github-actions[bot]]

PR Preview Action v1.4.7 :---: :rocket: Deployed preview to https://GameDevTecnico.github.io/cubos/docs-preview/pr-1111/ on branch gh-pages at 2024-04-08 14:49 UTC

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 38.35%. Comparing base (39b0dff) to head (392ad03).

:exclamation: Current head 392ad03 differs from pull request most recent head 41bad96. Consider uploading reports for the commit 41bad96 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1111 +/- ## ========================================== + Coverage 38.15% 38.35% +0.19% ========================================== Files 321 321 Lines 25644 25686 +42 ========================================== + Hits 9784 9851 +67 + Misses 15860 15835 -25 ```

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