Instrumentation for Azure 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 Azure services / backends for the different agents:

- CosmosDB
- Azure Storage
- Azure Queue
- Azure ServiceBus

## Spec issue
- [x] https://github.com/elastic/apm/issues/411

## Agent issues

### CosmosDB
- [ ] https://github.com/elastic/apm-agent-java/issues/1640
- [x] https://github.com/elastic/apm-agent-dotnet/issues/1154
- [ ] https://github.com/elastic/apm-agent-go/issues/884
- [ ] https://github.com/elastic/apm-agent-php/issues/338
- [x] https://github.com/elastic/apm-agent-ruby/issues/947
- [ ] https://github.com/elastic/apm-agent-nodejs/issues/1957
- [ ] https://github.com/elastic/apm-agent-python/issues/1027

### Azure Storage
- [ ] https://github.com/elastic/apm-agent-java/issues/1641
- [x] https://github.com/elastic/apm-agent-dotnet/issues/1155
- [ ] https://github.com/elastic/apm-agent-go/issues/885
- [ ] https://github.com/elastic/apm-agent-php/issues/339
- [x] https://github.com/elastic/apm-agent-ruby/issues/948
- [ ] https://github.com/elastic/apm-agent-nodejs/issues/1958
- [x] https://github.com/elastic/apm-agent-python/issues/1028

### Azure Queue
- [ ] https://github.com/elastic/apm-agent-java/issues/1642
- [x] https://github.com/elastic/apm-agent-dotnet/issues/1156
- [x] https://github.com/elastic/apm-agent-go/issues/886
- [ ] https://github.com/elastic/apm-agent-php/issues/340
- [ ] https://github.com/elastic/apm-agent-ruby/issues/949
- [ ] https://github.com/elastic/apm-agent-nodejs/issues/1959
- [x] https://github.com/elastic/apm-agent-python/issues/1029

### ServiceBus
- [ ] https://github.com/elastic/apm-agent-java/issues/1643
- [x] https://github.com/elastic/apm-agent-dotnet/issues/1157
- [ ] https://github.com/elastic/apm-agent-go/issues/887
- [ ] https://github.com/elastic/apm-agent-php/issues/341
- [ ] https://github.com/elastic/apm-agent-ruby/issues/950
- [ ] https://github.com/elastic/apm-agent-nodejs/issues/1960
- [ ] https://github.com/elastic/apm-agent-python/issues/1030

Start with the linked specification issue #411, then review the unchecked agent issues for CosmosDB, Azure Storage, Azure Queue, and ServiceBus. The issue’s stated completion target is instrumentation coverage across the listed agents and Azure services; confirm scope and status with maintainers before beginning.

Written by the indexing model from the issue text.