Add elementwise multiplication of signals

[mgrub]

Element-wise multiplication (Hadamar product) is a useful operation to enable applications like "windowing" and "gating" of signals in the time and frequency domain. Two new functions are introduced with this PR.

hadamar_product performs element-wise multiplication of two complex vectors of same length with full covariance uncertainty propagation according to the GUM.

window_application applies a real-valued window to a complex-valued signal. It relies on hadamar_product for the calculations.

Tests against slower implementations that use the non-optimized matrix multiplications are provided.

Docs can be found here: https://pydynamic.readthedocs.io/en/add_hadamar_product_unc/PyDynamic.uncertainty.html#module-PyDynamic.uncertainty.propagate_multiplication

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 96.22642% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 77.53%. Comparing base (67e664d) to head (93a79d1).

Files	Patch %	Lines
.../PyDynamic/uncertainty/propagate_multiplication.py	96.15%	0 Missing and 2 partials :warning:

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #328 +/- ## ========================================== + Coverage 77.32% 77.53% +0.21% ========================================== Files 29 30 +1 Lines 2280 2333 +53 Branches 372 378 +6 ========================================== + Hits 1763 1809 +46 - Misses 390 394 +4 - Partials 127 130 +3 ```

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