Store the ids retrieved from RCSB-PDB

[iacopy]

Very simple implementation of Issue #77

For each query, store the retrieved IDS in a file, one per line. Always overwrite the content.

[github-actions[bot]]

Coverage report

The coverage rate went from 100% to 100% :arrow_right: The branch rate is 100%.

None of the new lines are part of the tested code. Therefore, there is no coverage data about them.

[codecov[bot]]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (2384228) compared to base (4af6d77). Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #78 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 6 6 Lines 287 292 +5 Branches 53 54 +1 ========================================= + Hits 287 292 +5 ``` | [Impacted Files](https://codecov.io/gh/iacopy/RCSB-Sync/pull/78?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None) | Coverage Δ | | |---|---|---| | [src/project.py](https://codecov.io/gh/iacopy/RCSB-Sync/pull/78/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None#diff-c3JjL3Byb2plY3QucHk=) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=None)

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