feat: upgrade lance-namespace to 0.4.3

[jackye1995]

Also use Default:default() for constructing request and response models so that we don't need to make change to the struct inputs every time we add new things.

[github-actions]

Code Review

Summary: This PR upgrades lance-namespace from 0.4.0 to 0.4.3 and refactors request/response struct construction to use ..Default::default() for better forward compatibility.

Assessment: LGTM

No P0/P1 issues found. The changes are straightforward and improve maintainability.

The ..Default::default() pattern is a good practice that reduces churn when new optional fields are added to the namespace API structs.

Minor note: The #[allow(clippy::needless_update)] annotations in dir.rs:831 and manifest.rs:1371/1383 are correctly placed to suppress warnings when ..Default::default() is used on structs that currently have no additional fields - this is intentional for forward compatibility.

[codecov]

Codecov Report

❌ Patch coverage is 24.89592% with 902 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...ust/lance-namespace-impls/src/credentials/azure.rs	0.73%	403 Missing ⚠️
rust/lance-namespace-impls/src/credentials/aws.rs	0.99%	199 Missing ⚠️
rust/lance-namespace-impls/src/credentials/gcp.rs	8.54%	182 Missing ⚠️
rust/lance-namespace-impls/src/rest_adapter.rs	58.08%	66 Missing and 4 partials ⚠️
...ust/lance-namespace-impls/src/credentials/cache.rs	84.65%	29 Missing ⚠️
rust/lance-namespace-impls/src/credentials.rs	0.00%	14 Missing ⚠️
rust/lance-namespace-impls/src/dir.rs	80.00%	3 Missing ⚠️
rust/lance/src/dataset.rs	66.66%	1 Missing ⚠️
rust/lance/src/dataset/builder.rs	0.00%	1 Missing ⚠️

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