[9.x] Add query builder method whereJsonContainsKey()

[derekmd]

Resubmit of draft #41756 for new method whereJsonContainsKey(). This PR also allows checking for array integer keys, supports SQLite, and runs integration tests on each database driver.

DB::table('users')
    ->whereJsonContainsKey('options->languages')
    ->get();

DB::table('users')
    ->whereJsonDoesntContainKey('options->language->primary')
    ->get();

DB::table('users')
    ->whereJsonContainsKey('options->2fa[0]')
    ->get();

DB::table('users')
    ->whereJsonDoesntContainKey('options->2fa[0][1]')
    ->get();

[taylorotwell]

Thanks!

[tpetry]

@derekmd Is there a specific reason for the complex PostgreSQL implementation instead of just using jsonb_path_exists like for MySQL?

[derekmd]

@tpetry

https://laravel.com/docs/9.x/database#introduction

Laravel 9.x officially supports PostgreSQL 10.0+ but jsonb_path_exists() wasn't added until 12:

• https://www.postgresql.org/docs/12/functions-json.html
• https://www.postgresql.org/docs/11/functions-json.html (not documented)

Whereas Laravel supports MySQL 5.7+ and 5.7 has json_contains_path(): https://dev.mysql.com/doc/refman/5.7/en/json-search-functions.html#function_json-contains-path