[java] BQ: Add avro schema to BQ TableSchema conversion

[RustedBones]

Followup from #33221

Add conversion between Avro schema to BQ TableSchema

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Reminder, please take a look at this pr: @m-trieu @ahmedabu98

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Reminder, please take a look at this pr: @kennknowles @chamikaramj

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Reminder, please take a look at this pr: @robertwb @ahmedabu98

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Reminder, please take a look at this pr: @kennknowles @Abacn

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Reminder, please take a look at this pr: @damondouglas @johnjcasey

[Abacn]

Sorry for late reply. This looks good to me.

Just let me close and re-open the PR to retrigger the tests