check is `lttb` function applicable and usefull

[Slach]

Would be very cool would be to have an option to use the new lttb function in 23.10 for the downsampling. This could be an option to select in the plugin settings and/or maybe a completely new macro?

https://clickhouse.com/docs/en/sql-reference/aggregate-functions/reference/largestTriangleThreeBuckets

[Slach]

if we will implements $lttb(bucket_numbers, field1, field2)

shall transformed to something like that

WITH largestTriangleThreeBuckets(4)(field1, field2) AS lttb
SELECT untuple(arrayJoin(lttb)) FROM $table;