VTL - Aggregate operators

Name	Symbol	InMemory	WebAssembly
Aggregate invocation		✔️	❌
Counting the number of data points	count	✔️	❌
Minimum value	min	✔️	❌
Maximum value	max	✔️	❌
Median value	median	✔️	❌
Sum	sum	✔️	❌
Average value	avg	✔️	❌
Population standard deviation	stddev_pop	✔️	❌
Sample standard deviation	stddev_samp	✔️	❌
Population variance	var_pop	✔️	❌
Sample variance	var_samp	✔️	❌