Add output directory option, to differentiate from the data directory that stores all intermediate files

[davide-f]

What does this PR do?

Fixes Issue #40

This PR adds the option to disentangle the output directory from the data directory. This enables to optionally specifying where the output files are stored, while keeping the data storage in another folder.

Type of Change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] Chore (refactoring code or workflow improvements)
• [x] New feature (non-breaking change which adds functionality)
• [ ] This change requires a documentation update

Checklist

All Done

[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (861b4a4) 59.23% compared to head (e6e95a0) 59.30%.

Files	Patch %	Lines
earth_osm/eo.py	33.33%	2 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================== + Coverage 59.23% 59.30% +0.07% ========================================== Files 14 14 Lines 807 806 -1 ========================================== Hits 478 478 + Misses 329 328 -1 ```

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[mnm-matin]

These commits seem to also be in the buildings pr #46. To make it really simple I will just close this one.... unless I'm missing something.

[davide-f]

These commits seem to also be in the buildings pr #46. To make it really simple I will just close this one.... unless I'm missing something.

Np, the other PR is on top of this one, as you wish ;)