proxy: add measured-tokio

[conradludgate]

Problem

Summary of changes

Checklist before requesting a review

• I have performed a self-review of my code.
• If it is a core feature, I have added thorough tests.
• Do we need to implement analytics? if so did you add the relevant metrics to the dashboard?
• If this PR requires public announcement, mark it with /release-notes label and add several sentences in this section.

Checklist before merging

• Do not forget to reformat commit message to not include the above checklist

[github-actions]

3060 tests run: 2926 passed, 1 failed, 133 skipped (full report)

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Failures on Postgres 16

• test_ancestor_detach_branched_from[False-True-at]: debug

# Run all failed tests locally:
scripts/pytest -vv -n $(nproc) -k "test_ancestor_detach_branched_from[debug-pg16-False-True-at]"

Flaky tests (1)

Postgres 16

• test_vm_bit_clear_on_heap_lock: debug

Test coverage report is not available

_{The comment gets automatically updated with the latest test results
7b3fabb at 2024-05-11T11:36:20.300Z :recycle:}