feat(store): enforce single event-store writer with renewable lease

[daniel-mader]

Description of change

Only a single writer to the event store is allowed at any time.

Links to any relevant issues

Be sure to reference any related issues by adding fixes issue #.

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 2.06659% with 853 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
agent_store/src/mongodb_lease.rs	2.61%	521 Missing ⚠️
agent_store/src/postgres_lease.rs	1.36%	288 Missing ⚠️
agent_store/src/postgres.rs	0.00%	19 Missing ⚠️
agent_store/src/mongodb.rs	0.00%	13 Missing ⚠️
agent_application/src/lib.rs	0.00%	12 Missing ⚠️

Files with missing lines	Coverage Δ
agent_store/src/lib.rs	87.17% <ø> (ø)
agent_application/src/lib.rs	8.85% <0.00%> (-0.24%)	⬇️
agent_store/src/mongodb.rs	0.00% <0.00%> (ø)
agent_store/src/postgres.rs	0.00% <0.00%> (ø)
agent_store/src/postgres_lease.rs	1.36% <1.36%> (ø)
agent_store/src/mongodb_lease.rs	2.61% <2.61%> (ø)

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