Add new SLO checker for the metric of skipped/dropped-records

This MR adds an additional SLO checker for the metric of dropped-records

TODOS before ready to merge:

• update CI in order to create Docker images
• adding the new SLO checker to Helm (requires the previous todo)

Closes #250 (closed)

requested review from @she

mentioned in merge request !180 (merged)

changed milestone to %0.6.0

added 27 commits

• dd4f5191...edb188b1 - 26 commits from branch she:master
• 41f41a7c - Merge branch 'master' of git.se.informatik.uni-kiel.de:she/theodolite into...

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added 7 commits

• 41f41a7c...c548f277 - 5 commits from branch she:master
• 80e12a7d - Merge branch 'master' into wetzel/spesb-250-add-dropped-records-slo-correct-branch
• cc3e4526 - Add build and deploy step for new SLO checker

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marked the checklist item update CI in order to create Docker images as completed

added 1 commit

• c4c34a35 - Add dropped records SLO checker to Helm chart

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marked the checklist item adding the new SLO checker to Helm (requires the previous todo) as completed

merged

mentioned in commit aabe2ce1

assigned to @she