Add functions for time/frequency CRLBs

[codecov-commenter]

Codecov Report

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

Project coverage is 79.40%. Comparing base (b9984ff) to head (09580f7).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## release/0.0.x #359 +/- ## ================================================= + Coverage 78.94% 79.40% +0.45% ================================================= Files 62 63 +1 Lines 3733 3782 +49 ================================================= + Hits 2947 3003 +56 + Misses 786 779 -7 ```

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