feat(events/api): add GET SpeechListByCategory views, urls and tests

[josix]

Types of changes

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• [ ] Bugfix
• [x] New feature
• [ ] Refactoring
• [ ] Breaking change (any change that would cause existing functionality to not work as expected)
• [ ] Documentation Update
• [ ] Other (please describe)

Description

Describe what the change is

• Add api/events/speeches/category/<str:category> endpoint and its related view and test

Steps to Test This Pull Request

Steps to reproduce the behavior:

1. Running GET {API_HOST}/api/events/speeches/category/WEB or others category like DATA, ML, etc.

Expected behavior

List all events which have the corresponding category and have the same schema as the original Speech List API.

Related Issue

1080

[codecov-commenter]

Codecov Report

Merging #1085 (7ad1297) into master (cb06278) will increase coverage by 0.35%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #1085      +/-   ##
==========================================
+ Coverage   69.14%   69.49%   +0.35%     
==========================================
  Files          82       82              
  Lines        3315     3340      +25     
==========================================
+ Hits         2292     2321      +29     
+ Misses       1023     1019       -4     

Impacted Files	Coverage Δ
src/events/api/urls.py	100.00% <ø> (ø)
src/events/api/views.py	51.54% <100.00%> (+7.16%)	:arrow_up:
src/core/models.py	96.20% <0.00%> (+5.06%)	:arrow_up:

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