Obsidian Tasks syncronize with Google Tasks

[jmriego]

Description

I have created a script and sync side for Tasks in Markdown format. Specially following the format used in Obsidian.
It includes the title of the tasks, the completion status and the due/scheduled and done dates.

https://publish.obsidian.md/tasks/Introduction

Fixes # (issue) #121

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• This change requires a documentation update

How Has This Been Tested?

I have ran many manual tests including trying to break the syncronization. The main issue is that Markdown tasks are just text so there's no way of having a stable id. The way I have tried to solve that is to pickle changes in hash ids from tasks titles coming from Google Tasks. It saves a hidden file in the same directory as the tasks Markdown itself.

• Test basic synchronization
• Test empty files
• Test changes in task title coming from Google Tasks
• Changes in tasks titles in Markdown
• Check for changes simultateously in both sides (for conflicts)

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[jmriego]

This is ready to go but it would be missing some unit tests. Before I do that I'd like to check that in general you're ok with the approach and anything you'd like me to change or improve on