Add metrics for Azure blob storage

[arpad-m]

In issue #5590 it was proposed to implement metrics for Azure blob storage. This PR implements them except for the part that performs the rename, which is left for a followup.

Closes #5590

[github-actions]

3180 tests run: 3041 passed, 0 failed, 139 skipped (full report)

---

Flaky tests (2)

Postgres 16

• test_vm_bit_clear_on_heap_lock: debug

Postgres 14

• test_live_migration: release

Code coverage* (full report)

• functions: 31.4% (6531 of 20798 functions)
• lines: 48.3% (50414 of 104319 lines)

* collected from Rust tests only

---

_{The comment gets automatically updated with the latest test results
aedf081 at 2024-06-02T14:18:58.755Z :recycle:}