feat: perf-test for go (#812)

Author: ShubhamChaturvedi7

esdk-performance-testing/benchmarks/go/README.md

@@ -0,0 +1,45 @@
+# ESDK Go Benchmark
+
+Performance benchmark suite for the AWS Encryption SDK (ESDK) Go implementation.
+
+## Quick Start
+
+```bash
+# Run quick benchmark
+go run . --config ../../config/test-scenarios.yaml --quick
+
+# Run full benchmark
+go run . --config ../../config/test-scenarios.yaml
+```
+
+## Build
+
+```bash
+# Build release binary
+go build -o esdk-benchmark .
+
+# Run built binary
+./esdk-benchmark --quick
+```
+
+## Configuration
+
+The benchmark uses YAML configuration files. See `../../config/test-scenarios.yaml` for the full configuration format.
+
+### Quick Mode
+
+Quick mode runs a subset of tests with reduced iterations:
+
+- Only runs test types specified in `quick_config.test_types`
+- Uses smaller data sizes from `quick_config.data_sizes.small`
+- Fewer iterations: `quick_config.iterations.measurement`
+
+## Test Types
+
+- **throughput**: Measures operations per second and latency
+- **memory**: Measures peak memory usage during operations
+- **concurrency**: Tests performance under concurrent load
+
+## Output
+
+Results are saved to JSON format in `../../results/raw-data/go_results.json` by default.