[backend/frontend] Add pagination in exercise list and improv performance

[RomuDeuxfois]

Proposed changes

• Add pagination in exercise list
• Improv performance on exercise list

[codecov]

Codecov Report

Attention: Patch coverage is 1.09890% with 180 lines in your changes missing coverage. Please review.

Project coverage is 26.84%. Comparing base (0ab5ff1) to head (e389311).

Files	Patch %	Lines
...java/io/openbas/rest/exercise/ExerciseService.java	1.49%	66 Missing ⚠️
...ain/java/io/openbas/rest/exercise/ExerciseApi.java	0.00%	62 Missing ⚠️
...rc/main/java/io/openbas/service/InjectService.java	0.00%	46 Missing ⚠️
.../io/openbas/rest/scenario/ScenarioExerciseApi.java	16.66%	5 Missing ⚠️
.../io/openbas/rest/exercise/form/ExerciseSimple.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1090      +/-   ##
============================================
+ Coverage     26.82%   26.84%   +0.01%     
- Complexity     1057     1062       +5     
============================================
  Files           469      471       +2     
  Lines         11105    11192      +87     
  Branches        562      567       +5     
============================================
+ Hits           2979     3004      +25     
- Misses         8041     8104      +63     
+ Partials         85       84       -1     

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[Christian-DONGMO]

Everything is good.