[Subhankar] add env variable support in configuration file

[subhankarb]

No description provided.

[codecov]

Codecov Report

Patch coverage: 75.43% and project coverage change: -1.43 ⚠️

Comparison is base (2aac243) 81.76% compared to head (17a3fdc) 80.34%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main       #6      +/-   ##
==========================================
- Coverage   81.76%   80.34%   -1.43%     
==========================================
  Files          14       15       +1     
  Lines         362      407      +45     
==========================================
+ Hits          296      327      +31     
- Misses         66       80      +14     

Impacted Files	Coverage Δ
datachecks/core/metric/freshness_metric.py	90.90% <ø> (ø)
datachecks/core/metric/manager.py	84.84% <25.00%> (-8.26%)	⬇️
datachecks/core/configuration/config_loader.py	77.08% <77.08%> (ø)
datachecks/core/configuration/configuration.py	93.61% <100.00%> (+0.28%)	⬆️
datachecks/core/datasource/base.py	84.31% <100.00%> (-2.13%)	⬇️
datachecks/core/metric/base.py	88.40% <100.00%> (-0.17%)	⬇️

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