Add data objects

[marph91]

Main difference for users is to use note.id instead of note["id"].

[github-actions]

Unit Test Results

67 tests   - 1   64 ✔️  - 1   20s ⏱️ +4s
12 suites ±0     3 💤 ±0 
  1 files   ±0     0 ❌ ±0 

Results for commit 7e5599d. ± Comparison against base commit f6be54f.

This pull request removes 1 test.

test.test_api.Helper ‑ test_is_timestamp_valid

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Merging #17 (7e5599d) into master (f6be54f) will decrease coverage by 0.88%.
The diff coverage is 97.65%.

@@            Coverage Diff             @@
##           master      #17      +/-   ##
==========================================
- Coverage   98.98%   98.10%   -0.89%     
==========================================
  Files           2        3       +1     
  Lines         198      370     +172     
==========================================
+ Hits          196      363     +167     
- Misses          2        7       +5     

Impacted Files	Coverage Δ
joppy/api.py	97.90% <96.29%> (-1.07%)	⬇️
joppy/data_types.py	98.28% <98.28%> (ø)

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