Refactor Metrics

[teubert]

Refactored existing metrics.

Previous Implementation had metrics entirely in a file called samples. Each metric would work on only one item. Input to metrics would be an array of numbers.

Metrics have now been refactored to include the following changes:

• Metrics act on uncertain data (or ToEProfile for profile_based metrics)
  • Ability to act on array of numbers or array of dicts kept for backwards compatibility
• Metrics are no longer all in samples, they've been split based on what they act on (e.g., ToE Metrics, General Metrics, and ToE Profile Metrics)
• When relevant some metrics have been added as modules for the appropriate data structure (e.g., UncertainData)
• Added tests

See follow-up #93 which will add an example of alpha-lambda

Note: #91 must be merged before this works.

[teubert]

Note for the record: /test-prog-models-released are expected to fail, as the dev branch of prog_algs is not compatible with the currently released version (i.e., they include breaking changes).