Query event in Transaction should be proxied to the main client

[wubzz]

As discussed with @tgriesser in #855 the query event is no longer triggered onto the main client when in a transaction. It was simply a miss during the transaction overhaul, according to tgriessers's comments.

Example code:

dbClient.on('query', function(obj) {
    console.log('onQuery'); //Works in knex < 8.0.0, fails in >= 8.0.0
    return obj;
});

dbClient.transaction(function(tr) {
    return tr.raw('SELECT version()').then(tr.commit).catch(tr.rollback);
}).then(_.noop).catch(_.noop);

There may be better ways of fixing this, I don't know.

[rhys-vdw]

Hi @wubzz. That looks reasonable to me, and looks like it closes #855.

I've made a rule not to merge anything without tests as I am also not that familiarized with the codebase. So please add a couple of tests for these events and I'll merge it in.

[wubzz]

@rhys-vdw Truthfully having issues installing dependencies for knex on my windows env, and can't get it to work. Seems to primarily be mariasql where I have issues..

I commited a test hoping that I added it in the right place (also lack experience with the project structure/codebase), and hoping CI will pull through.

Pretty straight-forward test, tho.