[Pg] Fix RangeError in mergeQueries for large batch inserts

[skvarda]

Summary

Fixes #5994

mergeQueries in drizzle-orm/src/sql/sql.ts used result.params.push(...query.params) to concatenate params from sub-queries. The spread operator internally uses Function.prototype.apply, which has a hard argument limit in V8 (~125k on Node 22). When a nested SQL chunk accumulates params through recursive buildQueryFromSourceParams calls (e.g. a batch insert with ~8k rows x 15 cols = ~120k params), the outer mergeQueries call spreads the entire accumulated array and throws RangeError: Maximum call stack size exceeded.

Change

Replaced the spread operator with a for loop for both params and typings arrays in mergeQueries:

// Before (crashes on large arrays):
result.params.push(...query.params);

// After (no apply limit):
for (let i = 0; i < query.params.length; i++) {
    result.params.push(query.params[i]);
}

This eliminates the Function.prototype.apply argument-count limit and also removes the O(depth)-copies-per-param behaviour, making param collection O(total_params) instead of O(total_params x nesting_depth).

Test

Added drizzle-orm/tests/merge-queries.test.ts which builds a nested SQL with 200k params and verifies sqlToQuery() does not throw RangeError. This test fails before the fix and passes after.

All 567 existing unit tests continue to pass.