feat(memory): Allocator-backed global memory limits (microsoft#544)

Policy evaluation at scale needs to be able to set memory limits
so that a bad policy does not hog memory or to ensure that
policy evaluation itself does not use too much memory which could
cause other components to suffer.

This PR introduces capability to set and enforce global memory limits.
It also lays the groundwork for enabling per evaluation limits in future.

Once a global memory limit is set, Regorus maintains per thread counters
to track memory activity (allocation, deallocation) of a thread.
These counters are periodically flushed to global memory counters.
Per thread counters avoid the contention that updating global counters
on each alloc/free would cause.

Policy evaluation periodically checks these counters and raises errors
if allocated memory has exceeded the configured limit.

Currently memory limit capability is exposed only to FFI and C#.

Also update mimalloc to v2.2.6

Signed-off-by: Anand Krishnamoorthi <anakrish@microsoft.com>

Author: anakrish

.github/workflows/test-csharp.yml

@@ -11,7 +11,7 @@ on:
     - cron: "0 8 * * *"
 
 env:
-  VersionSuffix: ${{ github.event_name == 'workflow_dispatch' && 'manualtrigger' || null }}
+  VersionSuffix: ${{ github.run_id }}
 
 jobs:  
   build-ffi:
@@ -95,11 +95,11 @@ jobs:
 
       # Note that we need to supply the target folder within the folder where artifacts are downloaded.
       - name: Build Regorus binding
-        run: dotnet build /p:Configuration=Release /p:RegorusFFIArtifactsDir=./tmp/bindings/ffi/target
+        run: dotnet build /p:Configuration=Release /p:RegorusFFIArtifactsDir=./tmp/bindings/ffi/target /p:VersionSuffix=${{ env.VersionSuffix }}
         working-directory: ./bindings/csharp/Regorus
 
       - name: Pack
-        run: dotnet pack /p:RegorusFFIArtifactsDir=./tmp/bindings/ffi/target
+        run: dotnet pack /p:RegorusFFIArtifactsDir=./tmp/bindings/ffi/target /p:VersionSuffix=${{ env.VersionSuffix }}
         working-directory: ./bindings/csharp/Regorus
 
       - name: Upload Regorus nuget
@@ -144,15 +144,15 @@ jobs:
           path: ./bindings/csharp/regorus-nuget/
 
       - name: Restore Regorus.Tests
-        run: dotnet restore /p:RestoreAdditionalProjectSources=../regorus-nuget /p:UseLocalRegorus=false
+        run: dotnet restore /p:UseLocalRegorus=false /p:VersionSuffix=${{ env.VersionSuffix }} /p:RestoreAdditionalProjectSources=../regorus-nuget
         working-directory: ./bindings/csharp/Regorus.Tests
 
       - name: Run Regorus.Tests
-        run: dotnet test --no-restore -p:UseLocalRegorus=false
+        run: dotnet test --no-restore /p:UseLocalRegorus=false /p:VersionSuffix=${{ env.VersionSuffix }}
         working-directory: ./bindings/csharp/Regorus.Tests
 
       - name: Restore TestApp
-        run: dotnet restore /p:RestoreAdditionalProjectSources=../regorus-nuget
+        run: dotnet restore /p:VersionSuffix=${{ env.VersionSuffix }} /p:RestoreAdditionalProjectSources=../regorus-nuget
         working-directory: ./bindings/csharp/TestApp
 
       - name: Build TestApp
@@ -164,7 +164,7 @@ jobs:
         working-directory: ./bindings/csharp/TestApp
 
       - name: Restore TargetExampleApp
-        run: dotnet restore /p:RestoreAdditionalProjectSources=../regorus-nuget
+        run: dotnet restore /p:VersionSuffix=${{ env.VersionSuffix }} /p:RestoreAdditionalProjectSources=../regorus-nuget
         working-directory: ./bindings/csharp/TargetExampleApp
 
       - name: Build TargetExampleApp
@@ -174,5 +174,3 @@ jobs:
       - name: Run TargetExampleApp
         run: dotnet run --no-build --framework net8.0
         working-directory: ./bindings/csharp/TargetExampleApp
-
-