feat: Add evaluation context based on requirement 3.1.1

[maxveldink]

This PR

• adds a basic EvaluationContext which fulfills requirement 3.1. Note that this isn't used anywhere yet and I will continue to build it out by adding new spec requirements.

Follow-up Tasks

Will continue implementing other parts of EC and use it in clients

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.44%. Comparing base (aac74b1) to head (a43636e).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #114 +/- ## ========================================== + Coverage 99.40% 99.44% +0.03% ========================================== Files 12 13 +1 Lines 168 180 +12 ========================================== + Hits 167 179 +12 Misses 1 1 ```

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