[Feature Request] Provide POST endpoint for query+query_range

[grobie]

What did you do?

When using Grafana, template variables and the All option, the generated regex label matcher can become quite large. If the expression uses the same regex matcher multiple times (like in something{instance=~"$instance"} + something_else{instance=~"$instance"}) the generated expression can easily hit the URL size limit.

What do you want to see?

Sending these expressions in the body of a POST request would avoid the URL size limitations.

[lock]

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