fix: respect SORT direction when sorting GROUP BY keys

[hgabreu]

Problem

When a GROUP BY is followed by SORT ... DESC, the group keys are always sorted ascending. This is because the internal sort inside executeCore() was hardcoded to ascending order, regardless of the subsequent SORT operation.

Queries like:

table length(rows) as "Count"
from #book
where status = "read"
group by dateformat(date(date_read), "yyyy-MM") as "Year-Month"
sort date(date_read) desc

…produce groups in ascending order instead of descending.

Related issues: #966, #1671

Fix

In executeCore(), changed the for...of loop to an indexed loop so the current position in the ops array is known. When processing a group op, look ahead for an immediately following sort op and read its first field's direction. Use that to set a sort factor (-1 for descending, +1 for ascending/default) applied to the group key comparator.

Test

Verified locally by deploying the built plugin to an Obsidian vault and confirming that GROUP BY ... SORT ... DESC now produces groups in descending order.

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