Added api endpoints test cases (blocks, blocks_children)

[sudosubin]

I made a subdirectory ./tests/api_endpoints/ for ./notion_client/api_endpoints.py test cases, since there are amount of classes.

Any comments are welcome.

• Added BlocksEndpoint, BlocksChildrenEndpoint test case
• Some request/response come from notion api document.

[codecov[bot]]

Codecov Report

Merging #116 (56ab645) into main (d1819de) will increase coverage by 1.24%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
+ Coverage   83.81%   85.06%   +1.24%     
==========================================
  Files           7        7              
  Lines         241      241              
==========================================
+ Hits          202      205       +3     
+ Misses         39       36       -3     

Impacted Files	Coverage Δ
notion_client/client.py	83.92% <0.00%> (-1.79%)	:arrow_down:
notion_client/api_endpoints.py	75.43% <0.00%> (+8.77%)	:arrow_up:

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[ramnes]

Sorry for the long answer but I'm not sure what I want to do with the tests. On this PR specifically, I don't like the fact that the block ids are set in stone, and that since you are the one that generated the cassettes, I wouldn't be able to regenerate them myself with my own API key and Notion workspace. Do you have any idea on what we could do so that it's a bit more permissive?

[ramnes]

Closing because there is no answer from OP but feel free to answer with any hint regarding my previous comment and I will gladly reopen, I'm definitely interested in more tests. :)