Add .NET lambda limitations to docs

[jaffinito]

Describe the story, please be clear on scope of the story.

We should add the limitations to our docs. maybe in the approaches doc. Since this is not migration related, that doc would not work. I looked over the serverless docs and none of them feel like a good fit.

• https://docs.newrelic.com/docs/apm/agents/net-agent/getting-started/net-agent-approaches-lambda/

Limitations:

• Generic lambda Methods are not instrumented automatically. If your lambda method is a generic method (Such as Task MyMethod<TRequest, TResponse>(TRequest, ILambdaContext), the agent is not currently able to instrument that method.
• AspNetCore lambdas are not supported. The lambda AspNetCore integration relies on a generic method that is registered as the lambda handler, and generic lambda methods are not supported yet.
• Lambda Annotations Framework is not supported.
• ApiGatewayV2 events are missing some context required for Distributed Tracing.
• Outbound Distributed Tracing for different AWS SDK calls (such as SQS) are not supported.
• If your lambda method does not include an ILambdaContext parameter, the agent will not be able to gather all of the expected information about your Lambda.
• Native AOT .net lambdas are not supported.

[workato-integration]

https://new-relic.atlassian.net/browse/NR-296622