feat(base): add view visible fields shortcut

[timzhong1024]

Summary

• add base +view-set-visible-fields for PUT /open-apis/base/v3/bases/:base_token/tables/:table_id/views/:view_id/visible_fields
• accept either a raw string array or { "visible_fields": [...] } and reuse the existing wrapped view-property flow
• add shortcut coverage and docs, including the backend behavior that primaryField is always visible and forced to the first position

Merge Status

• draft only for now; do not merge yet
• blocked by backend rollout: the corresponding visible_fields endpoint is not available yet
• switch to ready-for-review only after the backend API is online and end-to-end verification is possible

Testing

• not run locally in this environment (go / gofmt are unavailable)

Resolves #34

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[zgz2048]

see #326