Bug 1931811 - Weather queries are slow due to lack of index on geonames_alternates(geoname_id)

This adds an index on `geonames_alternates(geoname_id)` plus some geonames and
weather benchmarks that I used to verify the change. The bug has some benchmark
numbers and discussion. The index speeds up weather queries by as much as ~98%,
going from hundreds of ms in the worst case to ~10ms.

Author: 0c0w3

components/suggest/benches/benchmark_all.rs

@@ -2,7 +2,13 @@ use criterion::{
     criterion_group, criterion_main, measurement::Measurement, BatchSize, BenchmarkGroup, Criterion,
 };
 use std::sync::Once;
-use suggest::benchmarks::{ingest, query, BenchmarkWithInput};
+use suggest::benchmarks::{geoname, ingest, query, BenchmarkWithInput};
+
+pub fn geoname(c: &mut Criterion) {
+    setup_viaduct();
+    let group = c.benchmark_group("geoname");
+    run_benchmarks(group, geoname::all_benchmarks())
+}
 
 pub fn ingest(c: &mut Criterion) {
     setup_viaduct();
@@ -44,5 +50,5 @@ fn setup_viaduct() {
     INIT.call_once(viaduct_reqwest::use_reqwest_backend);
 }
 
-criterion_group!(benches, ingest, query);
+criterion_group!(benches, geoname, ingest, query);
 criterion_main!(benches);