Attribute to collection

[SimonKonar]

Description:

This PR adds an env variable that determines by which attribute the sample should be mapped to corresponding collection, as specified in the type_to_collection_map.json

Checklist:

Make sure you tick all the boxes bellow if they are true or do not apply:

• [x] I have performed a self-review of my code
• [x] My code follows Google Python Style
• [x] I have made my code as simple as possible
• [x] I have added unit tests and the code coverage has not decreased
• [x] I have updated the documentation in all relevant places

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.95575% with 17 lines in your changes missing coverage. Please review.

Project coverage is 90.74%. Comparing base (61b9b5b) to head (95e1799).

Files	Patch %	Lines
persistence/sample_donor_csv_repository.py	50.00%	6 Missing :warning:
persistence/condition_csv_repository.py	66.66%	5 Missing :warning:
persistence/sample_csv_repository.py	78.94%	4 Missing :warning:
persistence/factories/csv_repository_factory.py	0.00%	1 Missing :warning:
persistence/factories/xml_repository_factory.py	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #21 +/- ## ========================================== - Coverage 90.81% 90.74% -0.07% ========================================== Files 63 64 +1 Lines 2319 2399 +80 ========================================== + Hits 2106 2177 +71 - Misses 213 222 +9 ``` | [Flag](https://app.codecov.io/gh/BBMRI-cz/fhir-module/pull/21/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-cz) | Coverage Δ | | |---|---|---| | [integration](https://app.codecov.io/gh/BBMRI-cz/fhir-module/pull/21/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-cz) | `33.27% <0.00%> (-1.17%)` | :arrow_down: | | [unit](https://app.codecov.io/gh/BBMRI-cz/fhir-module/pull/21/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-cz) | `73.04% <84.95%> (+0.54%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=BBMRI-cz#carryforward-flags-in-the-pull-request-comment) to find out more.

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