refactor: application actor (DEV-956)

[subotic]

Resolves DEV-956, DEV-300

PR Checklist

Please check if your PR fulfills the following requirements:

• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• Other... Please describe:

What is the current behavior?

Issue Number: DEV-956

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[irinaschubert]

What is the usage of this timer? Is it to measure the time it takes to write something into the cache? What is the use case behind that?

[codecov]

Codecov Report

Merging #2166 (0e8cd7e) into main (71c772f) will increase coverage by 0.20%.
The diff coverage is 73.04%.

@@            Coverage Diff             @@
##             main    #2166      +/-   ##
==========================================
+ Coverage   86.64%   86.84%   +0.20%     
==========================================
  Files         233      243      +10     
  Lines       28020    28191     +171     
==========================================
+ Hits        24277    24482     +205     
+ Misses       3743     3709      -34     

Impacted Files	Coverage Δ
...sp-shared/src/main/scala/dsp/valueobjects/V2.scala	84.05% <0.00%> (-1.45%)	⬇️
webapi/src/main/scala/org/knora/webapi/Main.scala	0.00% <0.00%> (ø)
...tore/triplestoremessages/TriplestoreMessages.scala	74.78% <ø> (-0.22%)	⬇️
...a/org/knora/webapi/messages/util/ValueUtilV1.scala	91.26% <ø> (-0.05%)	⬇️
...api/responders/admin/PermissionsResponderADM.scala	90.22% <ø> (ø)
...n/scala/org/knora/webapi/routing/RouteUtilV1.scala	81.81% <ø> (ø)
...org/knora/webapi/routing/SwaggerApiDocsRoute.scala	76.92% <ø> (ø)
.../scala/org/knora/webapi/routing/VersionRoute.scala	100.00% <ø> (ø)
...org/knora/webapi/routing/admin/FilesRouteADM.scala	85.71% <ø> (ø)
...rg/knora/webapi/routing/admin/GroupsRouteADM.scala	97.89% <ø> (ø)
... and 79 more

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