refactor(v3): add project slice (DEV-1009)

[BalduinLandolt]

Resolves DEV-1009

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
• [x] 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-1009

What is the new behavior?

Does this PR introduce a breaking change?

• [ ] Yes
• [x] No

Other information

[sonarcloud[bot]]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
25 Code Smells

No Coverage information
11.7% Duplication

[codecov[bot]]

Codecov Report

Merging #2076 (961c593) into main (71c772f) will increase coverage by 0.08%. The diff coverage is 98.40%.

@@            Coverage Diff             @@
##             main    #2076      +/-   ##
==========================================
+ Coverage   86.64%   86.72%   +0.08%     
==========================================
  Files         233      241       +8     
  Lines       28020    28173     +153     
==========================================
+ Hits        24277    24433     +156     
+ Misses       3743     3740       -3     

Impacted Files	Coverage Δ
...sp-shared/src/main/scala/dsp/valueobjects/V2.scala	84.05% <0.00%> (-1.45%)	:arrow_down:
...a/org/knora/webapi/messages/util/ValueUtilV1.scala	91.26% <ø> (-0.05%)	:arrow_down:
...n/scala/org/knora/webapi/routing/RouteUtilV1.scala	81.81% <ø> (ø)
...p-shared/src/main/scala/dsp/valueobjects/Iri.scala	94.31% <83.33%> (+0.06%)	:arrow_up:
...e/src/main/scala/dsp/project/api/ProjectRepo.scala	100.00% <100.00%> (ø)
.../main/scala/dsp/project/domain/ProjectDomain.scala	100.00% <100.00%> (ø)
...ain/scala/dsp/project/handler/ProjectHandler.scala	100.00% <100.00%> (ø)
.../scala/dsp/project/repo/impl/ProjectRepoLive.scala	100.00% <100.00%> (ø)
...sp-shared/src/main/scala/dsp/valueobjects/Id.scala	69.23% <100.00%> (+44.23%)	:arrow_up:
...d/src/main/scala/dsp/valueobjects/LangString.scala	100.00% <100.00%> (ø)
... and 10 more

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