Adding debug hook and rules configuration with tests

[brightsparc]

Issue #28

Description of changes:

Added support for reading debugger hook and rules from the estimator and writing to the API eg:

from sagemaker.debugger import Rule, rule_configs, DebuggerHookConfig, CollectionConfig

hook_config = DebuggerHookConfig(
    s3_output_path='s3://{0}/{1}/output/debug'.format(bucket, prefix),
    hook_parameters={
        "save_interval": "1"
    },
    collection_configs=[
        CollectionConfig("hyperparameters"),
        CollectionConfig("metrics"),
        CollectionConfig("predictions"),
        CollectionConfig("labels"),
        CollectionConfig("feature_importance")
    ]
)

xgb = sagemaker.estimator.Estimator(
    # Initialize your hook.
    debugger_hook_config=hook_config,
   
    # Initialize your rules for the hook
    rules=[Rule.sagemaker(rule_configs.confusion(),
                             rule_parameters={
                                 "category_no": "15",
                                 "min_diag": "0.7",
                                 "max_off_diag": "0.3",
                                 "start_step": "17",
                                 "end_step": "19"}
                         )]
)

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