Support "number of centroids" for `approx_percentile_cont_with_weight`

[crepererum]

Is your feature request related to a problem or challenge?

While approx_percentile_cont supports the number of centroids (last parameter that is optional):

datafusion/docs/source/user-guide/sql/aggregate_functions.md

Lines 832 to 855 in 853eee0

	### `approx_percentile_cont`
	Returns the approximate percentile of input values using the t-digest algorithm.
	```sql
	approx_percentile_cont(percentile, centroids) WITHIN GROUP (ORDER BY expression)
	```
	#### Arguments
	- **expression**: The expression to operate on. Can be a constant, column, or function, and any combination of operators.
	- **percentile**: Percentile to compute. Must be a float value between 0 and 1 (inclusive).
	- **centroids**: Number of centroids to use in the t-digest algorithm. _Default is 100_. A higher number results in more accurate approximation but requires more memory.
	#### Example
	```sql
	> SELECT approx_percentile_cont(0.75, 100) WITHIN GROUP (ORDER BY column_name) FROM table_name;
	+-----------------------------------------------------------------------+
	| approx_percentile_cont(0.75, 100) WITHIN GROUP (ORDER BY column_name) |
	+-----------------------------------------------------------------------+
	| 65.0 |
	+-----------------------------------------------------------------------+
	```

approx_percentile_cont_with_weight does not:

datafusion/docs/source/user-guide/sql/aggregate_functions.md

Lines 857 to 880 in 853eee0

	### `approx_percentile_cont_with_weight`
	Returns the weighted approximate percentile of input values using the t-digest algorithm.
	```sql
	approx_percentile_cont_with_weight(weight, percentile) WITHIN GROUP (ORDER BY expression)
	```
	#### Arguments
	- **expression**: The expression to operate on. Can be a constant, column, or function, and any combination of operators.
	- **weight**: Expression to use as weight. Can be a constant, column, or function, and any combination of arithmetic operators.
	- **percentile**: Percentile to compute. Must be a float value between 0 and 1 (inclusive).
	#### Example
	```sql
	> SELECT approx_percentile_cont_with_weight(weight_column, 0.90) WITHIN GROUP (ORDER BY column_name) FROM table_name;
	+---------------------------------------------------------------------------------------------+
	| approx_percentile_cont_with_weight(weight_column, 0.90) WITHIN GROUP (ORDER BY column_name) |
	+---------------------------------------------------------------------------------------------+
	| 78.5 |
	+---------------------------------------------------------------------------------------------+
	```

That is somewhat surprising/inconsistent.

Describe the solution you'd like

Add an optional last parameter similar to approx_percentile_cont.

Describe alternatives you've considered

No supporting this.

Additional context

-

[liamzwbao]

take