Adds a new setting dataproxy.row_limit that allows an operator to limit the
amount of rows being processed/accepted in response to database queries
originating from SQL data sources.
Closes#38975
Ref #39095
Co-authored-by: achatterjee-grafana <70489351+achatterjee-grafana@users.noreply.github.com>
* Introduce response_limit for datasource responses
* Fix lint
* Fix tests
* Add case where limit <= 0 - added parametrized tests
* Add max_bytes_reader.go
* Use new httpclient.MaxBytesReader instead of net/http one
* Fixes according to reviewer's comments
* Add tests for max_bytes_reader
* Add small piece in configuration.md
* Further fixes according to reviewer's comments
* Fix linting - fix test
Make sure that default timeout settings are based on configuration
parameters. This now applies for core data sources using old TSDB
contracts and new SDK contracts. Before it was only applied for old TSDB
contracts.
Also moves global setting variables to non-global (setting.Cfg).
