Real-time (causal) phase estimation algo

[nbara]

Implements code from this paper: https://doi.org/10.1038/s41598-021-97560-5

[codecov[bot]]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (9204cfd) 79.88% compared to head (3006332) 81.83%.

Files	Patch %	Lines
meegkit/utils/buffer.py	94.02%	4 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #75 +/- ## ========================================== + Coverage 79.88% 81.83% +1.94% ========================================== Files 22 24 +2 Lines 2362 2637 +275 ========================================== + Hits 1887 2158 +271 - Misses 475 479 +4 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.