Problem & FIX to SQL Server Input Plugin round large values in Performance Counters

# Problem: SQL Server Input Plugin round large values in Performance Counters

When the performance counter has very large values, the query that obtains the data from the SQL Server database performs a rounding by means of a statement CAST (……… float (10)) that prevents the precise calculation of derived values.

## Solution
The solution is change all CAST statements in this queries to increase the precision by changing to CAST (……… float (53)).

### Fragment of the query with the problem

```
SELECT
'sqlserver_performance' AS [measurement]
,REPLACE(@@SERVERNAME,'\',':') AS [sql_instance]
,pc.[object_name] AS [object]
,pc.[counter_name] AS [counter]
,CASE pc.[instance_name] WHEN '_Total' THEN 'Total' ELSE ISNULL(pc.[instance_name],'') END AS [instance]
,CAST(
CASE
WHEN pc.[cntr_type] = 537003264 AND pc1.[cntr_value] > 0
THEN (pc.[cntr_value] * 1.0) / (pc1.[cntr_value] * 1.0) * 100
ELSE pc.[cntr_value]
--------------------------------------------------------------------
--- Round too much for large values and cumulative counter
--- Change 10 for 53 to solve the problem
--------------------------------------------------------------------
END AS float(10)) AS [value]
--------------------------------------------------------------------
,CAST(pc.[cntr_type] AS varchar(25)) AS [counter_type]
FROM @PCounters AS pc
LEFT OUTER JOIN @PCounters AS pc1
ON (
pc.[counter_name] = REPLACE(pc1.[counter_name],' base','')
OR pc.[counter_name] = REPLACE(pc1.[counter_name],' base',' (ms)')
)
AND pc.[object_name] = pc1.[object_name]
AND pc.[instance_name] = pc1.[instance_name]
AND pc1.[counter_name] LIKE '%base'
WHERE
pc.[counter_name] NOT LIKE '% base'
OPTION(RECOMPILE)
```

Search the repository for the SQL Server input plugin and the CAST expression using float(10), then read the surrounding performance-counter query. Update the relevant precision casts and verify that the query preserves large counter values without rounding.

Written by the indexing model from the issue text.