feat: add support for audio modality in multi2vec-google vectorizer config

[antas-marcin]

Summary

• Add audio_fields parameter to the multi2vec-google and multi2vec-google-gemini vectorizer configurations, matching the pattern used by multi2vec-bind
• Update all factory methods across _Vectorizer, NamedVectors, and Vectors classes (including the deprecated multi2vec_palm variants)
• Add audioFields to the _Multi2VecGoogleConfig data class

Closes #1984

Test plan

• Unit tests added for Configure.Vectorizer.multi2vec_google with audio fields (string list, Multi2VecField objects, weighted fields)
• Unit tests added for Configure.NamedVectors.multi2vec_google with audio fields
• Unit tests added for Configure.Vectors.multi2vec_google and Configure.Vectors.multi2vec_google_gemini with audio fields (including weighted variant)
• All 166 existing config tests pass

[orca-security-eu]

Orca Security Scan Summary

Status	Check	Issues by priority
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Passed	SAST	0   0   0   0	View in Orca
Passed	Secrets	0   0   0   0	View in Orca
Passed	Vulnerabilities	0   0   0   0	View in Orca

[dirkkul]

Update all factory methods across _Vectorizer, NamedVectors, and Vectors classes (including the deprecated multi2vec_palm variants)

Could you remove it from the deprecated methods? we want to push users to the new ones, eg palm, NamedVectors and _Vectorizer should go away

[tsmith023]

Could you remove it from the deprecated methods?

I'll do this now