Fix: BigQuery fromAvro ByteBuffer should be readOnly

[regadas]

Fixes #3218

[codecov]

Codecov Report

Merging #3220 into master will decrease coverage by 2.60%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3220      +/-   ##
==========================================
- Coverage   72.95%   70.34%   -2.61%     
==========================================
  Files         232      232              
  Lines        7639     7639              
  Branches      322      325       +3     
==========================================
- Hits         5573     5374     -199     
- Misses       2066     2265     +199     

Impacted Files	Coverage Δ
...potify/scio/bigquery/types/ConverterProvider.scala	100.00% <ø> (ø)
...scala/com/spotify/scio/bigquery/client/Cache.scala	0.00% <0.00%> (-74.08%)	⬇️
.../spotify/scio/bigquery/client/BigQueryConfig.scala	0.00% <0.00%> (-70.59%)	⬇️
.../spotify/scio/bigquery/BigQueryPartitionUtil.scala	0.00% <0.00%> (-52.50%)	⬇️
...scala/com/spotify/scio/bigquery/BigQueryUtil.scala	50.00% <0.00%> (-50.00%)	⬇️
...otify/scio/bigquery/syntax/ScioContextSyntax.scala	19.35% <0.00%> (-41.94%)	⬇️
...la/com/spotify/scio/bigquery/client/QueryOps.scala	0.73% <0.00%> (-39.71%)	⬇️
.../scala/com/spotify/scio/bigquery/StorageUtil.scala	0.00% <0.00%> (-36.85%)	⬇️
...com/spotify/scio/bigquery/types/BigQueryType.scala	58.33% <0.00%> (-29.17%)	⬇️
...la/com/spotify/scio/bigquery/client/TableOps.scala	0.00% <0.00%> (-25.00%)	⬇️
... and 5 more

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