feat: add PUT /lambda-endpoint route to update lambda client endpoint

[bchampp]

Issue #, if available:

Description of changes:
Adding a new route to the web layer that allows us to dynamically update the lambda invoke endpoint of the server. This is needed for SAM CLI because ports are assigned dynamically, and we need to update the emulator lambda endpoint to the port that gets exposed for the lambda RIE.

Tested it by running the server locally and validating the API calls work:

➜  aws-durable-execution-sdk-python-testing git:(feat/add-put-lambda-endpoint) curl -X PUT http://localhost:5002/lambda-endpoint \
  -H "Content-Type: application/json" \
  -d '{
    "EndpointUrl": "http://localhost:9000"
  }'
➜  aws-durable-execution-sdk-python-testing git:(feat/add-put-lambda-endpoint) curl -X PUT http://localhost:5002/lambda-endpoint \     
  -H "Content-Type: application/json" \
  -d '{
    "EndpointUrl": "http://localhost:9000",
    "RegionName": "us-west-2"  
  }'                               
{"message":"Lambda endpoint updated successfully"

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[yaythomas]

        except Exception as e:  # noqa: BLE001
            return self._handle_framework_exception(e)

[yaythomas]

please use

return self._handle_aws_exception( InvalidParameterValueException("EndpointUrl is required"))