Update `dsp/processor/__init__.py` to contain `interpolated_time_point_thresh()`

[erin717]

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (a492e41) 48.22% compared to head (8887b1c) 48.22%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #488 +/- ## ======================================= Coverage 48.22% 48.22% ======================================= Files 104 104 Lines 12452 12452 ======================================= Hits 6005 6005 Misses 6447 6447 ``` | [Impacted Files](https://app.codecov.io/gh/legend-exp/pygama/pull/488?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=legend-exp) | Coverage Δ | | |---|---|---| | [src/pygama/dsp/processors/\_\_init\_\_.py](https://app.codecov.io/gh/legend-exp/pygama/pull/488?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=legend-exp#diff-c3JjL3B5Z2FtYS9kc3AvcHJvY2Vzc29ycy9fX2luaXRfXy5weQ==) | `100.00% <100.00%> (ø)` | |

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