feat: keep all projections in memory

[daniel-mader]

Description of change

Instead of persisting all view updates (event projections) into the database, they are kept in-memory.
They are fully recreated on application startup through the persisted events.
This offers more flexibility, while certain views can still individually be persisted at a later time in an optimized database if needed.

Links to any relevant issues

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How the change has been tested

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Definition of Done checklist

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• I have followed the contribution guidelines for this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have successfully tested this change in a docker environment

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 68.23529% with 351 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agent_application/src/lib.rs	25.00%	96 Missing ⚠️
agent_store/src/mongodb.rs	0.00%	86 Missing ⚠️
agent_store/src/postgres.rs	0.00%	69 Missing ⚠️
agent_store/src/replay.rs	74.34%	49 Missing ⚠️
agent_store/src/custom_queries.rs	62.92%	33 Missing ⚠️
agent_api_http/src/projection_sizes.rs	97.95%	10 Missing ⚠️
agent_store/src/in_memory.rs	70.37%	8 Missing ⚠️

Files with missing lines	Coverage Δ
agent_api_http/src/lib.rs	46.70% <ø> (ø)
agent_application/src/probes/readiness.rs	100.00% <100.00%> (ø)
agent_shared/src/lib.rs	51.61% <ø> (ø)
agent_store/src/event_verification.rs	79.84% <100.00%> (+0.47%)	⬆️
agent_store/src/lib.rs	87.17% <100.00%> (+0.44%)	⬆️
agent_store/src/in_memory.rs	83.87% <70.37%> (-16.13%)	⬇️
agent_api_http/src/projection_sizes.rs	97.95% <97.95%> (ø)
agent_store/src/custom_queries.rs	62.92% <62.92%> (ø)
agent_store/src/replay.rs	74.34% <74.34%> (ø)
agent_store/src/postgres.rs	0.00% <0.00%> (ø)
... and 2 more

... and 6 files with indirect coverage changes

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