Added support for the `numpy.diff()` function.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 98.55072% with 1 line in your changes missing coverage. Please review.

Project coverage is 94.78%. Comparing base (4becc81) to head (ea9b7fb). Report is 15 commits behind head on main.

Files	Patch %	Lines
named_arrays/_vectors/vectors.py	50.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #54 +/- ## ========================================== + Coverage 94.73% 94.78% +0.05% ========================================== Files 73 73 Lines 10210 10277 +67 ========================================== + Hits 9672 9741 +69 + Misses 538 536 -2 ``` | [Flag](https://app.codecov.io/gh/sun-data/named-arrays/pull/54/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sun-data) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/sun-data/named-arrays/pull/54/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sun-data) | `94.78% <98.55%> (+0.05%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=sun-data#carryforward-flags-in-the-pull-request-comment) to find out more.

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