feat. The library should expose the meta data returned by a request

[sebsto]

When calling InvokeModel or Converse APIs, Bedrock not only returns the response but also metadata, such as the token count, the latency, the service tier, etc.

As of today, our Converse API returns a Message that doesn't expose these metadata

For Converse, see

swift-bedrock-library/Sources/BedrockService/BedrockRuntimeClient/Converse/Message.swift

Line 86 in 0a88772

public init(from sdkMessage: BedrockRuntimeClientTypes.Message) throws {

swift-bedrock-library/Sources/BedrockService/BedrockRuntimeClient/Converse/Message.swift

Line 97 in 0a88772

public init(_ response: ConverseOutput) throws {

For Invoke Model, see

swift-bedrock-library/Sources/BedrockService/BedrockRuntimeClient/InvokeModel/BedrockService+InvokeModelText.swift

Line 125 in 0a88772

let invokemodelResponse: InvokeModelResponse = try InvokeModelResponse.createTextResponse(

The library should expose these metadata to the user.