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GH-42243: [Swift] Update isValidBuilderType to not required instance of type (#42244)

### Rationale for this change
isValidBuilderType should take a Type and not require an instance of a type in order to validate.

### What changes are included in this PR?
Updated isValidBuilderType to take a Type instead of an instance.

### Are these changes tested?
Yes

* GitHub Issue: #42243

Authored-by: Alva Bandy <abandy@live.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>