* azuremonitor: add support for log analytics macros

Also adds tests for the kql macros

* azuremonitor: backend implementation for Log Analytics

* azuremonitor: remove gzip header from plugin route

The Go net/http library adds an accept encoding header
for gzip automatically.

https://golang.org/src/net/http/transport.go\#L2454

So no need to specify it manually

* azuremonitor: parses log analytics time series

* azuremonitor: support for table data for Log Analytics

* azuremonitor: for log analytics switch to calling the API...

...from the backend for time series and table queries.

* azuremonitor: fix missing err check

* azuremonitor: support Azure China, Azure Gov...

for log analytics on the backend.

* azuremonitor: review fixes

* azuremonitor: rename test files folder to testdata

To follow Go conventions for test data in tests

* azuremonitor: review fixes

* azuremonitor: better error message for http requests

* azuremonitor: fix for load workspaces on config page

* azuremonitor: strict null check fixes

Co-authored-by: bergquist <carl.bergquist@gmail.com>