Refactor job system and update project configuration

Added:
- Added `JobExecutor.cs` for job execution management.
- Added `JobInfo.cs` to hold job execution information.
- Added `TestJobSystem.cs` for unit tests of the job system.
- Added `TestJobs.cs` for additional job implementation tests.
- Added `WorkerThread.cs` to manage worker threads for jobs.

Changed:
- Changed `AssemblyInfo.cs.cs` to include a global using directive for `unsafe JobExecuteFunc`.
- Changed `IJob.cs` to include an overload of the `Execute` method with a `threadIndex` parameter.
- Changed `JobHandle.cs` to include an `IsValid` property and updated internal structure.
- Changed `JobScheduler.cs` to improve job scheduling and management.
- Changed `JobsUtility.cs` to enhance job management functions.
- Changed `MemoryBlock.cs` to reference the heap from which memory was allocated.
- Changed `ParallelNoiseBenchmark.cs` to include benchmarks for the job system.
- Changed `Program.cs` to execute benchmarks instead of previous test code.

Removed:
- Removed `.gitignore` entries for default ignored files.
- Removed `JobBase.cs` to shift from structs to classes for jobs.
- Removed `JobExtensions.cs` indicating a change in job scheduling.
- Removed `JobStruct.cs` indicating a change in job structure.
- Removed `encodings.xml`, `indexLayout.xml`, and `vcs.xml` files to simplify project configuration.
- Removed fields from `JobData.cs` to simplify the job data structure.
- Removed `TestJobSystem.csproj` entries related to old project structure.

Misaki.HighPerformance.Jobs/IJob.cs

@@ -2,25 +2,25 @@
 
 /// <summary>
 /// Represents a job that performs a single unit of work.
-/// Jobs are structs to avoid allocations and enable high-performance execution.
 /// </summary>
 public interface IJob
 {
     /// <summary>
     /// Executes the job logic.
     /// </summary>
-    void Execute();
+    /// <param name="threadIndex">The index of the thread executing the job, useful for thread-specific operations.</param>
+    void Execute(int threadIndex);
 }
 
 /// <summary>
 /// Represents a job that performs the same operation for a set of items, executed in parallel.
-/// Each job instance processes a range of indices, enabling data parallelism.
 /// </summary>
 public interface IJobParallelFor
 {
     /// <summary>
     /// Executes the job for a single item at the given index.
     /// </summary>
-    /// <param name="index">The index of the item to process.</param>
-    void Execute(int index);
+    /// <param name="loopIndex">The index of the item to process.</param>
+    /// <param name="threadIndex">The index of the thread executing the job, useful for thread-specific operations.</param>
+    void Execute(int loopIndex, int threadIndex);
 }