Solace Read connector: Use ByteBuffer instead of BytesString in the Record class

[bzablocki]

Beam Schemas don't support ByteString types. The pipeline was throwing the following exception in runtime:

    SEVERE: Error occurred within org.apache.beam.runners.direct.DirectTransformExecutor@3df140ba
    java.lang.VerifyError: Bad type on operand stack
    Exception Details:
      Location:
        org/apache/beam/sdk/io/solace/data/SchemaUserTypeCreator$SchemaCodeGen$uTIIUHuv.create([Ljava/lang/Object;)Ljava/lang/Object; @90: invokevirtual
      Reason:
        Type 'java/lang/Iterable' (current frame, stack[2]) is not assignable to 'org/apache/beam/vendor/grpc/v1p60p1/com/google/protobuf/ByteString'
      Current Frame:
        bci: @90
        flags: { }
        locals: { 'org/apache/beam/sdk/io/solace/data/SchemaUserTypeCreator$SchemaCodeGen$uTIIUHuv', '[Ljava/lang/Object;' }
        stack: { 'org/apache/beam/sdk/io/solace/data/AutoValue_Solace_Record$Builder', 'org/apache/beam/sdk/io/solace/data/AutoValue_Solace_Record$Builder', 'java/lang/Iterable' }

I changed the field type to BufferString, which is supported by the Schemas.
(addresses #31440).

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[bzablocki]

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[bzablocki]

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[m-trieu]

LGTM

[bzablocki]

Thank you @m-trieu ! Is it ready to merge or are we waiting for another LGTM?