Use ESM syntax, and update deps to support it

This switches from the commonjs require() syntax to the newer ESM
import syntax.

Jest did not work with the ESM syntax, so I updated the Jest config to
use esbuild to transpile the ESM syntax to commonjs, so Jest can still
run the tests.

We do this in the main CO2.js package, to it seemed an ok precedent to
follow.

This also updates better-sqlite, to use a new version which seems to
offer pre-builds, as of #1002 on the better sqlite repo.
WiseLibs/better-sqlite3#1002

README.md

@@ -7,13 +7,13 @@ Normally you can check domain against the The Green Web Foundation url2green dat
 
 ```js
 
-const greencheck = require('@tgwf/hosting')
+import greencheck from "@tgwf/hosting"
 
 // returns true if green, otherwise false
-greencheck.check("google.com")
+await greencheck.check("google.com")
 
 // returns an array of the green domains, in this case ["google"].
-greencheck.check(["google.com", "kochindustries.com"])"]
+await  greencheck.check(["google.com", "kochindustries.com"])"]
 ```
 
 ## Usage
@@ -27,13 +27,13 @@ To do so, install this module with `npm install @tgwf/url2green`. You can then u
 
 ```js
 
-const hostingDB = require('@tgwf/hosting-database');
+import hostingDB from "@tgwf/hosting-database"
 
 // returns true if green, otherwise false
-hostingDB.check("google.com", "path/to/database.db");
+await hostingDB.check("google.com", "path/to/database.db");
 
 // returns an array of the green domains, in this case ["google.
-hostingDB.check(["google.com", "kochindustries.com"], "path/to/database.db");
+await hostingDB.check(["google.com", "kochindustries.com"], "path/to/database.db");
 ```
 
 ## Fetching the latest copy of the url2green dataset
@@ -44,9 +44,9 @@ You can generate a simple JSON list of the domains to check against, with `dumpD
 
 
 ```js
-const hostingDB = require('@tgwf/hosting-database');
+import hostingDB from "@tgwf/hosting-database"
 
-hostingDB.dumpDomains("path/to/database.db", "path/to/output.json");
+await hostingDB.dumpDomains("path/to/database.db", "path/to/output.json");
 ```
 
 In cases where you don't want to rely on SQLite, this will generate a JSON file that allows you to perform the same lookups, using the `@tgwf/co2` module.