Remove websocket support

[rukai]

websocket support for shotover is a really cool idea, enabling some unique tooling, such as querying cassandra directly from a webbrowser, with just shotover in between.

Unfortunately given that:

• websocket support is non-standard to any of the protocols in shotover
• I'm not aware of anyone attempting to use it
• it adds a lot of extra code and dependencies to the project, increasing maintenance burden

I am proposing to delete it.
If we ever decide we want it back, it can easily be restored from the previous commit.

[codspeed-hq]

Merging this PR will improve performance by 20.05%

⚡ 5 improved benchmarks
✅ 31 untouched benchmarks
⏩ 2 skipped benchmarks¹

Performance Changes

	Benchmark	BASE	HEAD	Efficiency
⚡	decode_request_fetch_create	10.9 µs	9.7 µs	+13.15%
⚡	decode_request_metadata_create	8.5 µs	7.1 µs	+20.05%
⚡	decode_request_produce_create	10.2 µs	8.9 µs	+14.19%
⚡	decode_request_metadata_drop	2.7 µs	2.4 µs	+13.43%
⚡	decode_request_list_offsets_create	10.7 µs	9.4 µs	+14.16%

---

_{Comparing rukai:remove-ws-support (b822378) with main (15a58b0)²}

Footnotes

1. 2 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

2. No successful run was found on main (e650ae3) during the generation of this report, so 15a58b0 was used instead as the comparison base. There might be some changes unrelated to this pull request in this report. ↩