[backend] Adding XLS importer

[Dimfacion]

Proposed changes

• Adding XLS importer endpoints

Related issues

Checklist

• [ ] I consider the submitted work as finished
• [ ] I tested the code for its functionality
• [ ] I wrote test cases for the relevant uses case
• [ ] I added/update the relevant documentation (either on github or on notion)
• [ ] Where necessary I refactored code to improve the overall quality

Further comments

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 20.83506% with 3811 lines in your changes missing coverage. Please review.

Project coverage is 26.65%. Comparing base (413b28e) to head (ff5a098). Report is 368 commits behind head on issue/290.

:exclamation: Current head ff5a098 differs from pull request most recent head 1fc4a4a

Please upload reports for the commit 1fc4a4a to get more accurate results.

Files	Patch %	Lines
...main/java/io/openbas/importer/V1_DataImporter.java	39.40%	289 Missing and 17 partials :warning:
...ain/java/io/openbas/rest/exercise/ExerciseApi.java	0.50%	198 Missing :warning:
...io/openbas/injectors/lade/service/LadeService.java	2.52%	193 Missing :warning:
...rc/main/java/io/openbas/rest/inject/InjectApi.java	31.42%	187 Missing and 5 partials :warning:
...ain/java/io/openbas/rest/document/DocumentApi.java	9.40%	183 Missing :warning:
.../io/openbas/injectors/caldera/CalderaExecutor.java	2.02%	145 Missing :warning:
...njectors/caldera/client/CalderaInjectorClient.java	1.83%	107 Missing :warning:
...src/main/java/io/openbas/rest/stream/ai/AiApi.java	4.50%	106 Missing :warning:
...io/openbas/rest/exercise/form/ExerciseDetails.java	0.00%	101 Missing :warning:
...ectors/caldera/service/CalderaInjectorService.java	2.04%	96 Missing :warning:
... and 155 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## issue/290 #1092 +/- ## =============================================== - Coverage 27.26% 26.65% -0.61% - Complexity 901 1061 +160 =============================================== Files 395 479 +84 Lines 8782 11208 +2426 Branches 397 560 +163 =============================================== + Hits 2394 2987 +593 - Misses 6328 8136 +1808 - Partials 60 85 +25 ```

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