feat: initial solution with HrynCo.DAL.Abstract and HrynCo.DAL.EF

- HrynCo.DAL.Abstract: IEntity<TId>, Entity base classes, ITransaction, IUnitOfWork
- HrynCo.DAL.EF: EfRepository<TDbContext,TEntity>, EfUnitOfWork<TDbContext>, EfTransactionAdapter
- Directory.Packages.props with centralized EF Core 9.0.5 versions
- TeamCity pipeline YAMLs for general-checks and publish

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.teamcity/pipelines/general-checks.yaml

@@ -0,0 +1,13 @@
+jobs:
+  general-checks:
+    name: general-checks
+    runs-on:
+      self-hosted:
+        - teamcity.agent.name: ItemTrackerDotNet10
+    steps:
+      - type: script
+        script-content: dotnet restore hrynco-ef.slnx
+      - type: script
+        script-content: dotnet build hrynco-ef.slnx -c Release --no-restore
+      - type: script
+        script-content: dotnet test hrynco-ef.slnx --no-build -c Release

.teamcity/pipelines/publish.yaml

@@ -0,0 +1,38 @@
+# Build number pattern should be set to: 1.0.%build.counter%
+# Trigger: on push to main branch
+
+jobs:
+  publish:
+    name: publish
+    runs-on:
+      self-hosted:
+        - teamcity.agent.name: ItemTrackerDotNet10
+    steps:
+      - type: script
+        script-content: >-
+          pwsh -Command "Set-Content -Path 'Directory.Build.props' -Encoding UTF8 -Value
+          '<Project><PropertyGroup><Version>%build.number%</Version></PropertyGroup></Project>'"
+
+      - type: script
+        script-content: dotnet restore hrynco-ef.slnx
+
+      - type: script
+        script-content: dotnet build hrynco-ef.slnx -c Release --no-restore
+
+      - type: script
+        script-content: dotnet pack hrynco-ef.slnx -c Release --no-build -o artifacts
+
+      - type: script
+        script-content: >-
+          dotnet nuget push "artifacts/HrynCo.DAL.Abstract.*.nupkg"
+          --api-key %nuget-api-key%
+          --source https://api.nuget.org/v3/index.json
+
+      - type: script
+        script-content: >-
+          dotnet nuget push "artifacts/HrynCo.DAL.EF.*.nupkg"
+          --api-key %nuget-api-key%
+          --source https://api.nuget.org/v3/index.json
+
+secrets:
+  nuget-api-key: credentialsJSON:a414ca02-733e-4588-9a5d-e0f0f5653d48