Instrumentation for AWS services

For better OOTB support for cloud services we aim for extending our supported instrumentation for the APM agents.
This theme is about providing instrumentation for common AWS services / backends for the different agents:

- DynamoDB
- S3
- SNS
- SQS

## Spec issue
- [x] https://github.com/elastic/apm/issues/409

## Agent issues

### DynamoDB
- [x] https://github.com/elastic/apm-agent-java/issues/1636
- [ ] https://github.com/elastic/apm-agent-dotnet/issues/1150
- [x] https://github.com/elastic/apm-agent-go/issues/880
- [ ] https://github.com/elastic/apm-agent-php/issues/334
- [x] https://github.com/elastic/apm-agent-ruby/issues/943
- [x] https://github.com/elastic/apm-agent-nodejs/issues/1953
- [x] https://github.com/elastic/apm-agent-python/issues/1023

### AWS S3
- [x] https://github.com/elastic/apm-agent-java/issues/1637
- [ ] https://github.com/elastic/apm-agent-dotnet/issues/1151
- [x] https://github.com/elastic/apm-agent-go/issues/881
- [ ] https://github.com/elastic/apm-agent-php/issues/335
- [x] https://github.com/elastic/apm-agent-ruby/issues/944
- [x] https://github.com/elastic/apm-agent-nodejs/issues/1954
- [x] https://github.com/elastic/apm-agent-python/issues/1024

### AWS SNS
- [ ] https://github.com/elastic/apm-agent-java/issues/1638
- [ ] https://github.com/elastic/apm-agent-dotnet/issues/1152
- [x] https://github.com/elastic/apm-agent-go/issues/882
- [ ] https://github.com/elastic/apm-agent-php/issues/336
- [x] https://github.com/elastic/apm-agent-ruby/issues/945
- [x] https://github.com/elastic/apm-agent-nodejs/issues/1955
- [x] https://github.com/elastic/apm-agent-python/issues/1025

### AWS SQS
- [x] https://github.com/elastic/apm-agent-java/issues/1639
- [ ] https://github.com/elastic/apm-agent-dotnet/issues/1153
- [x] https://github.com/elastic/apm-agent-go/issues/883
- [ ] https://github.com/elastic/apm-agent-php/issues/337
- [x] https://github.com/elastic/apm-agent-ruby/issues/946
- [x] https://github.com/elastic/apm-agent-nodejs/issues/1956
- [x] https://github.com/elastic/apm-agent-python/issues/1026