Feature request: support `initial_dump` subscribe field

[lekkas]

Context: https://docs.polymarket.com/changelog/changelog#websocket-changes%3A-release-date%3A-may-28%2C-2025

• The 100 token subscription limit has been removed for the Markets channel. You can now subscribe to as many token IDs as needed for your use case.

• New Subscribe Field initial_dump

  • Optional field to indicate whether you want to receive the initial order book state when subscribing to a token or list of tokens.
    default: true

[Maxim-Mazurok]

Hey @lekkas since this is what I wanted and it's default - I didn't look much into it, but copilot vibe-coded this here in my fork just for fun: Maxim-Mazurok#12

I'm currently using my fork with a few improvements (added user channel and error handling), so it might work for you as well, cheers!

[lekkas]

Amazing @Maxim-Mazurok ! 🤩

If you could send a PR in this repo I'll happily merge asap, otherwise I'll do it in the next couple of weeks. 😍

Did you test it on any production workload, or at least using the Polymarket API (other passing the new tests, which I'm happy to see you already added)

Thank you!

[Maxim-Mazurok]

Yeah, it seems to be working fine for me, but I'm in more of an experimental phase with a $150 budget, so my "production" might be different from yours :D

I opened #2 but up to you what to do with it, I'm not super invested :) I liked the idea of group management, and wanted to see how copilot will handle it, I think it did well.

There's another PR in progress to reduce code duplicates, but not sure when it will land as it's low priority for me and I feel like copilot might stuggle with it a bit: Maxim-Mazurok#8

Cheers!