feat: support fractional reconnect delays

[Sn0wo2]

<3

[NotRyken]

What use-case is this associated with?

[Sn0wo2]

What use-case is this associated with?

Where I need to retry joining a server at a high frequency

When I connect to mc.hypixel.net through a proxy, the proxy IP may sometimes be blocked by Cloudflare Spectrum. In that case, I may need to repeatedly attempt to rejoin before the connection eventually succeeds

I'm not the only person experiencing this issue:
https://hypixel.net/threads/i-am-about-to-scream-why-can-i-never-connect-to-hypixel.6063303/
https://hypixel.net/threads/cant-connect-to-server.6136142/

If reconnecting has a minimum delay of 1 second, it unnecessarily wastes more time. Allowing the delay to be set to 0.1 seconds would let me retry joining the server much more quickly

[NotRyken]

Noted, I'm not sure that rapidly retrying is likely to be a good idea (you may trip a rate limit, for example) but I suppose that responsibility can be left to the user.

[NotRyken]

On the whole, seems like a pretty good implementation. I do have some questions/comments though, see inline.

[NotRyken]

Had to double-check my previous assertion. Turned out it was incorrect: MC does not in fact use String#format in any form, and automatically converts %d, %f in translation strings to %s.

That being the case, I've pushed a commit to replace all placeholders in translation keys with %s for clarity, and adjusted the countdown display to only display the decimal part when it's below 10 seconds (and then only one decimal place).

[NotRyken]

See previous comment, but since it was my error I've pushed a commit to fix it. Content with the state of this now, though I'm not sure when it will be released.