docs(bucket_retention): add examples

examples/resources/minio_s3_bucket_retention/main.tf

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+terraform {
+  required_providers {
+    minio = {
+      source  = "aminueza/minio"
+      version = ">= 2.0.0"
+    }
+  }
+}
+
+provider "minio" {
+  minio_server   = var.minio_server
+  minio_region   = var.minio_region
+  minio_user     = var.minio_user
+  minio_password = var.minio_password
+}
+

examples/resources/minio_s3_bucket_retention/resource.tf

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+resource "minio_s3_bucket" "test_bucket" {
+  bucket          = "test-retention-bucket"
+  force_destroy   = true
+  object_locking  = false
+}
+
+# Add basic retention configuration
+resource "minio_s3_bucket_retention" "test_retention" {
+  bucket          = minio_s3_bucket.test_bucket.bucket
+  mode            = "GOVERNANCE"
+  unit            = "YEARS"
+  validity_period = 1
+}

examples/resources/minio_s3_bucket_retention/variables.tf

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+variable "minio_region" {
+  description = "Default MINIO region"
+  default     = "us-east-1"
+}
+
+variable "minio_server" {
+  description = "Default MINIO host and port"
+  default     = "localhost:9000"
+}
+
+variable "minio_user" {
+  description = "MINIO user"
+  default     = "minio"
+}
+
+variable "minio_password" {
+  description = "MINIO password"
+  default     = "minio123"
+}