[backend] Add Spotless

[isselparra]

Proposed changes

• Add spotless plugin

mvn spotless:check

mvn spotless:apply

[codecov]

Codecov Report

Attention: Patch coverage is 31.25320% with 2688 lines in your changes missing coverage. Please review.

Project coverage is 32.24%. Comparing base (404d0be) to head (2053994).

Files with missing lines	Patch %	Lines
.../io/openbas/injectors/caldera/CalderaExecutor.java	0.00%	265 Missing ⚠️
...io/openbas/injectors/lade/service/LadeService.java	1.91%	205 Missing ⚠️
...nbas/injectors/openbas/OpenBASImplantExecutor.java	0.00%	184 Missing ⚠️
...o/openbas/injectors/email/service/ImapService.java	18.26%	168 Missing and 2 partials ⚠️
...main/java/io/openbas/importer/V1_DataImporter.java	34.46%	147 Missing and 7 partials ⚠️
...ectors/caldera/service/CalderaInjectorService.java	0.00%	136 Missing ⚠️
...njectors/caldera/client/CalderaInjectorClient.java	0.89%	111 Missing ⚠️
...caldera/service/CalderaResultCollectorService.java	5.45%	104 Missing ⚠️
...cutors/caldera/service/CalderaExecutorService.java	8.84%	102 Missing and 1 partial ⚠️
.../openbas/rest/attack_pattern/AttackPatternApi.java	6.97%	80 Missing ⚠️
... and 74 more

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1634      +/-   ##
============================================
- Coverage     33.17%   32.24%   -0.93%     
- Complexity     1600     1609       +9     
============================================
  Files           561      561              
  Lines         14649    16755    +2106     
  Branches        896      963      +67     
============================================
+ Hits           4860     5403     +543     
- Misses         9558    11108    +1550     
- Partials        231      244      +13     

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