Feat get elements data

[Suraporn]

• revise new function
• relocate data folder
• test all code = pass

[codecov[bot]]

Codecov Report

Base: 87.02% // Head: 87.23% // Increases project coverage by +0.21% :tada:

Coverage data is based on head (fb50130) compared to base (6ed2e3b). Patch coverage: 95.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #41 +/- ## ========================================== + Coverage 87.02% 87.23% +0.21% ========================================== Files 2 2 Lines 131 141 +10 ========================================== + Hits 114 123 +9 - Misses 17 18 +1 ``` | [Impacted Files](https://codecov.io/gh/UBC-MDS/chembox/pull/41?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=UBC-MDS) | Coverage Δ | | |---|---|---| | [src/chembox/chembox.py](https://codecov.io/gh/UBC-MDS/chembox/pull/41?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=UBC-MDS#diff-c3JjL2NoZW1ib3gvY2hlbWJveC5weQ==) | `87.05% <95.00%> (+0.22%)` | :arrow_up: | 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=UBC-MDS). 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=UBC-MDS)

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[xFiveRivers]

Looks good! Thanks for fixing the pytest errors!