Add deprecation warning for otel (#1008)

Author: dayaffe

Sources/ClientRuntime/Telemetry/Providers/OpenTelemetry/OTelProvider.swift

@@ -13,17 +13,20 @@ import SmithyTelemetryAPI
 @preconcurrency import protocol OpenTelemetrySdk.SpanExporter
 
 /// Namespace for the SDK Telemetry implementation.
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public enum OpenTelemetrySwift {
     /// The SDK TelemetryProviderOTel Implementation.
     ///
     /// - contextManager: no-op
     /// - loggerProvider: provides SwiftLoggers
     /// - meterProvider: no-op
     /// - tracerProvider: provides OTelTracerProvider with InMemoryExporter
+    @available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
     public static func provider(spanExporter: any SpanExporter) -> TelemetryProvider {
         return OpenTelemetrySwiftProvider(spanExporter: spanExporter)
     }
 
+    @available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
     public final class OpenTelemetrySwiftProvider: TelemetryProvider {
         public let contextManager: TelemetryContextManager
         public let loggerProvider: LoggerProvider

Sources/ClientRuntime/Telemetry/Providers/OpenTelemetry/OTelTracing.swift

@@ -24,12 +24,17 @@
 import struct Smithy.AttributeKey
 import struct Smithy.Attributes
 
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public typealias OpenTelemetryTracer = OpenTelemetryApi.Tracer
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public typealias OpenTelemetrySpanKind = OpenTelemetryApi.SpanKind
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public typealias OpenTelemetrySpan = OpenTelemetryApi.Span
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public typealias OpenTelemetryStatus = OpenTelemetryApi.Status
 
 // Trace
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public final class OTelTracerProvider: TracerProvider {
     private let sdkTracerProvider: TracerProviderSdk
 
@@ -46,6 +51,7 @@ public final class OTelTracerProvider: TracerProvider {
     }
 }
 
+@available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
 public final class OTelTracerImpl: Tracer {
     private let otelTracer: OpenTelemetryTracer
 

Sources/ClientRuntime/Telemetry/Providers/OpenTelemetry/OTelUtils.swift

@@ -15,6 +15,7 @@ import struct Smithy.AttributeKey
 import struct Smithy.Attributes
 
 extension Attributes {
+    @available(*, deprecated, message: "Moved to smithy-swift-opentelemetry package. Removal after March 10, 2026.")
     public func toOtelAttributes() -> [String: AttributeValue] {
         let keys: [String] = self.getKeys()
         var otelKeys: [String: AttributeValue] = [:]