feat: add datastore API for fetching a single event by ID

[ErikBjare]

No description provided.

[codecov]

Codecov Report

Merging #109 (a0814b0) into master (0629e84) will increase coverage by 0.12%.
The diff coverage is 97.14%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
+ Coverage   90.88%   91.01%   +0.12%     
==========================================
  Files          34       34              
  Lines        1678     1702      +24     
  Branches      291      292       +1     
==========================================
+ Hits         1525     1549      +24     
  Misses        118      118              
  Partials       35       35              

Impacted Files	Coverage Δ
aw_datastore/storages/mongodb.py	25.80% <0.00%> (ø)
aw_datastore/datastore.py	100.00% <100.00%> (ø)
aw_datastore/storages/abstract.py	97.05% <100.00%> (+0.18%)	⬆️
aw_datastore/storages/memory.py	94.80% <100.00%> (+0.51%)	⬆️
aw_datastore/storages/peewee.py	99.32% <100.00%> (+0.01%)	⬆️
aw_datastore/storages/sqlite.py	96.91% <100.00%> (+0.20%)	⬆️

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