Default sweeper class to read hyperparameters

[SabhyaC26]

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Need a class that will read hyperparameters from a sweep config file

Describe the solution you'd like
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A class that will:

• read hyperparameters from file
• instantiate a sweep object that will be able to pass those hyperparams to a tango run

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Not applicable

Additional context
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This issue is a part of a larger project: Hyperparameter sweeps #143