feat(examples): add image_scale (#7)

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examples/vadd_event/README.md

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+# Vector Addition — Immediate Command List with Events
+
+> ![Tips]
+> **SYCL** is used to write this kernel, which is not a common practice.
+> Please also have a look at the **OpenCL** kernel examples like [image_scale](../image_scale/).
+
+The same vector addition workload as the `vadd` example, but driven by an **immediate command list** and **events** instead of explicit command queues. This demonstrates fine-grained dependency tracking: memory copies signal events, and the kernel launch waits on those events before executing.
+
+## What It Does
+
+1. Discovers a GPU device and prints its basic & compute properties
+2. Allocates host and device memory for two float32 vectors (256 MiB each)
+3. Fills both vectors with random values
+4. Loads a SPIR-V kernel (`vector_add`) that computes `a[i] += b[i]` in parallel
+5. Creates an **event pool** with 3 events to express data-flow dependencies
+6. Submits all work through a single **immediate command list**:
+   - Two H→D copies, each signaling its own event
+   - Kernel launch that **waits** on both copy events before executing
+   - D→H copy that waits on the kernel event
+7. Synchronizes via `HostSynchronize` on the immediate command list
+8. Validates every element against the CPU reference
+
+## Key Difference from `vadd`
+
+| Aspect | `vadd` | `vadd_event` |
+|--------|--------|-------------|
+| Submission | 3 separate command lists executed on a command queue | 1 immediate command list |
+| Synchronization | `zeCommandQueueSynchronize` | `zeCommandListHostSynchronize` |
+| Dependencies | Implicit via command list ordering + barriers | Explicit via events (wait lists) |
+
+## Run
+
+```bash
+go run main.go
+```
+
+## Sample Output
+
+```
+===============  Device Basic Properties  ===============
+Running on device: ID = 32103 , Name = Intel(R) Graphics @ 0.00 GHz.
+=============== Device Compute Properties ===============
+Max Group Size (X, Y, Z):    (1024, 1024, 1024)
+Max Group Count (X, Y, Z):   (4294967295, 4294967295, 4294967295)
+Max Total Group Size:        1024
+Max Shared Local Memory:     65536
+Num Subgroup Sizes:          3
+Subgroup Sizes:              [8 16 32 0 0 0 0 0]
+=============== Computation Configuration ===============
+Group Size (X, Y, Z):        (1024, 1, 1)
+Group Count:                 65536
+Total Elements (N):          67108864
+Buffer Size:                 256 MiB
+===============    Calculation Results    ===============
+GPU Execution Time:          51.768500 ms
+GPU Throughput:              5.19 GiB/s
+===============    Validation Results    ===============
+CPU Execution Time:          38.237400 ms
+CPU Throughput:              7.02 GiB/s
+Test Passed!!!
+```