JSON concrete tests

[christopher-wild]

This PR enables concrete tests to be run using the JSON format:

"tests": [
                {
                    "name": "test1",
                    "treatment_variable": "test_input",
                    "control_value": 0,
                    "treatment_value": 1,
                    "estimator": "LinearRegressionEstimator",
                    "estimate_type": "ate",
                    "expectedEffect": {"test_output": "NoEffect"},
                    "skip": False,
                }
            ]

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ PYTHON	black	24		0	1.13s
✅ PYTHON	pylint	24		0	4.39s

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[codecov]

Codecov Report

Merging #179 (2b919ed) into main (fb06924) will increase coverage by 0.08%.
The diff coverage is 96.87%.

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
+ Coverage   93.29%   93.37%   +0.08%     
==========================================
  Files          19       19              
  Lines        1312     1329      +17     
==========================================
+ Hits         1224     1241      +17     
  Misses         88       88              

Impacted Files	Coverage Δ
causal_testing/json_front/json_class.py	98.13% <96.87%> (-0.48%)	⬇️

... and 1 file with indirect coverage changes

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