Merge linkedin/go-zk changes upstream

[PapaCharlie]

It may be more convenient to look at these changes sequentially:

• https://github.com/linkedin/go-zk/pull/1: This introduces support for persistent watches, introduced in ZK 3.5. It requires a new data structure which queues data infinitely, otherwise it could hang the zk connection handling as a whole.
• https://github.com/linkedin/go-zk/pull/2: Support ZK 3.9 which relays the zxid that triggered a specific watch even to fire.
• https://github.com/linkedin/go-zk/pull/3: Add a timestamp field to zk.Event which is set when the event is received. Useful for tracking how long it took to get to a specific event (especially relevant when consuming from persistent watches).
• https://github.com/linkedin/go-zk/pull/4: Make the EventQueue introduced in https://github.com/linkedin/go-zk/pull/1 generic, to support using it in other places.
• https://github.com/linkedin/go-zk/pull/5: QOL life changes. Use log/slog instead of providing a custom logger interface. Change the Dialer interface to something that's trivially implemented by tls.Dialer and net.Dialer, making it much easier to provide client certificates when connecting to ZK. Improve the error handling by returning stacked errors. Especially convenient when trying to understand why a specific connection was closed. Note that this PR would require a new major version as it does introduce backwards incompatible changes.
• https://github.com/linkedin/go-zk/pull/6 and https://github.com/linkedin/go-zk/pull/7: Provide a new HostProvider that more closely matches the Java client's implementation, i.e. it resolves the address on-demand rather than once statically. This is also backwards incompatible as it changes the semantics of the HostProvider implementation to support sleeping after attempting to connect to the address returned by Next, rather than before.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 69.06475% with 129 lines in your changes are missing coverage. Please review.

Project coverage is 75.00%. Comparing base (c5e730e) to head (d59ad1b).

Files	Patch %	Lines
conn.go	64.94%	78 Missing and 17 partials :warning:
staticdnshostprovider.go	70.00%	8 Missing and 4 partials :warning:
structs.go	75.00%	8 Missing and 2 partials :warning:
unlimited_channel.go	82.60%	4 Missing and 4 partials :warning:
constants.go	0.00%	3 Missing :warning:
dnshostprovider.go	91.66%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #122 +/- ## ========================================== - Coverage 75.94% 75.00% -0.95% ========================================== Files 7 10 +3 Lines 1193 1452 +259 ========================================== + Hits 906 1089 +183 - Misses 196 252 +56 - Partials 91 111 +20 ```

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