* Capture error_type label on metrics/traces
* Make error messages more helpful to user
* Use errutil, categorized errors, and tie them to error_type (category in code)
* Misc trace fixes
* Add metric to track SQL input conversion
Adds settings for SQL expressions:
sql_expression_cell_output_limit
Set the maximum number of cells that can be returned from a SQL expression. Default is 100000.
sql_expression_timeout
The duration a SQL expression will run before being cancelled. The default is 10s.
* Under feature flag `sqlExpressions` and is experimental
* Excluded from arm32
* Will not work with the Query Service yet
* Does not have limits in place yet
* Does not working with alerting yet
* Currently requires "prepare time series" Transform for time series viz
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Co-authored-by: Sam Jewell <sam.jewell@grafana.com>