Added CI for running unit tests.

[dblock]

Signed-off-by: dblock [email protected]

Description

• Now running unit tests.
• Added OpenSearch 2.4.0.
• Tests pass by default.

Closes #45.

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[codecov-commenter]

Codecov Report

Merging #112 (81d6108) into main (ec224bf) will increase coverage by 4.60%.
The diff coverage is n/a.

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@@            Coverage Diff             @@
##             main     #112      +/-   ##
==========================================
+ Coverage   42.28%   46.89%   +4.60%     
==========================================
  Files          50       60      +10     
  Lines       28085    29066     +981     
==========================================
+ Hits        11877    13631    +1754     
+ Misses      16208    15435     -773     

Flag	Coverage Δ
integration	42.28% <ø> (ø)
unit	7.17% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
opensearch/src/lib.rs	97.72% <ø> (+97.72%)	⬆️
opensearch/tests/cert.rs	100.00% <ø> (ø)
opensearch/tests/client.rs	100.00% <ø> (ø)
opensearch/tests/error.rs	100.00% <ø> (ø)
opensearch/tests/common/server.rs	100.00% <0.00%> (ø)
api_generator/src/lib.rs	100.00% <0.00%> (ø)
opensearch/examples/aws_auth.rs	0.00% <0.00%> (ø)
api_generator/src/bin/run.rs	1.23% <0.00%> (ø)
opensearch/examples/cat_indices.rs	0.00% <0.00%> (ø)
... and 16 more

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[dblock]

Updated with the suggestions, good calls!