fix(Client): Move client initialization code

[vakiliner]

Please describe the changes this PR makes and why it should be merged:

Closes #11180

Status and versioning classification:

• Code changes have been tested against the Discord API, or there are no code changes
• I know how to update typings and have done so, or typings don't need updating

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[Qjuh]

I'd say the better fix would be to move all the READY event handling into READY.js, not the other way around. Or at least the checkReady() call

[vakiliner]

I'd say the better fix would be to move all the READY event handling into READY.js, not the other way around. Or at least the checkReady() call

I just noticed that the Ready event is async
None of the packet handlers are async, so calling this function won't be awaitable
While this can easily be fixed by adding "await" before "PacketHandlers[packet.t](this, packet, shardId);", but is it necessary?

[vakiliner]

I'd say the better fix would be to move all the READY event handling into READY.js, not the other way around. Or at least the checkReady() call

I believe this was not added to READY.js on purpose because the handler is async

[Qjuh]

I'd say the better fix would be to move all the READY event handling into READY.js, not the other way around. Or at least the checkReady() call

I believe this was not added to READY.js on purpose because the handler is async

Since I was the one who wrote that I can assure you that's not the reason. In v14 the checkReady check is in READY.js; this was simply an oversight when adapting to the direct use of /ws and should be reverted to check in READY.js

adding await would be a good idea however, and then the checkReady check for READY event could be added to handlePacket instead. Similar to how it checks for GUILD_CREATE and _DELETE.

[vakiliner]

In v14 the checkReady check is in READY.js

Then checkReady() was not async

[didinele]

before merging, we should give this a little test.

@Jiralite would you mind? otherwise, I can get to it tonight
discord.js@15.0.0-move-client-init.1761650119-a4c0a246f

[didinele]

was a little later than "tonight", but I got to it. we should be good :)