resource-detectors: add support for host ID detection on macOS

[djc]

Changes

Implement host_id_detect() for macOS per the spec.

Output from cargo test -- --nocapture:

[opentelemetry-resource-detectors/src/host.rs:114:9] &resource = Resource {
    inner: ResourceInner {
        attrs: {
            Static(
                "host.id",
            ): String(
                Owned(
                    "60F28E1A-C070-5873-85C1-5ABC138C66B9",
                ),
test host::tests::test_resource_host_arch_value ...     ok
        ),
            Static(
                "host.arch",
            ): String(
                Static(
                    "aarch64",
                ),
            ),
        },
        schema_url: None,
    },
}

Merge requirement checklist

• [x] CONTRIBUTING guidelines followed
• [x] Unit tests added/updated (if applicable)
• [x] Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• [x] Changes in public API reviewed (if applicable)

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 41.0%. Comparing base (56a6f45) to head (78d6bf8). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #73 +/- ## ======================================== - Coverage 52.3% 41.0% -11.3% ======================================== Files 38 27 -11 Lines 4967 3294 -1673 ======================================== - Hits 2598 1351 -1247 + Misses 2369 1943 -426 ```

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