Crop edges update simplified

[jordiferrero]

Description of the change

Following the request to make #142 cleaner and separate the crop_ede function from other changes, this is the clean version of the PR, aiming to extend the functionality of crop_edges.

Progress of the PR

• [x] Change implemented (can be split into several points),
• [x] docstring updated (if appropriate),
• [x] update user guide (if appropriate),
• [x] added tests,
• [x] added line to CHANGELOG.md,
• [x] ready for review.

[codecov-commenter]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage :thumbsup:

Coverage data is based on head (8d66281) compared to base (cc5507b). Patch coverage: 100.00% of modified lines in pull request are covered.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #177 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 12 12 Lines 545 614 +69 ========================================= + Hits 545 614 +69 ``` | [Impacted Files](https://codecov.io/gh/LumiSpy/lumispy/pull/177?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LumiSpy) | Coverage Δ | | |---|---|---| | [lumispy/signals/common\_luminescence.py](https://codecov.io/gh/LumiSpy/lumispy/pull/177?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LumiSpy#diff-bHVtaXNweS9zaWduYWxzL2NvbW1vbl9sdW1pbmVzY2VuY2UucHk=) | `100.00% <100.00%> (ø)` | | | [lumispy/utils/signals.py](https://codecov.io/gh/LumiSpy/lumispy/pull/177?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LumiSpy#diff-bHVtaXNweS91dGlscy9zaWduYWxzLnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LumiSpy). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=LumiSpy)

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[jordiferrero]

As discussed, this is now ready for review @jlaehne . Hope it is easier to see what is new.