Draft implementation of streaming range request

[serathius]

Achieves better latecy and memory usage.

Tested using

go run ./tools/benchmark/ put --total 10000 --val-size 100000
go run ./tools/benchmark/ range 00000000 zzzzzzzz --total 50 --clients 5 --stream

Type	Memory [GiB]	Latency 50%ile	Latency 90%ile	Latency 95%ile
Base	1.0
NoStream	19.1	5.32	8.78	9.3
Stream Limit=100	1.3	5.3	5.48	5.5
Stream Limit based on Size	1.1	6.05	6.14	6.14

[k8s-ci-robot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[k8s-ci-robot]

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[serathius]

Previous draft #12343

[k8s-ci-robot]

@serathius: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci-etcd-robustness-release35-amd64	7cf5d72	link	true	/test ci-etcd-robustness-release35-amd64
ci-etcd-robustness-release36-amd64	7cf5d72	link	true	/test ci-etcd-robustness-release36-amd64
ci-etcd-robustness-release34-amd64	7cf5d72	link	true	/test ci-etcd-robustness-release34-amd64
pull-etcd-govulncheck-main	7cf5d72	link	true	/test pull-etcd-govulncheck-main
pull-etcd-govulncheck	af8fce5	link	true	/test pull-etcd-govulncheck

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[k8s-ci-robot]

PR needs rebase.

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