Fix inconsistent AvroSchema type and value for SqlType.Date values

[Abacn]

Please add a meaningful description for your change here

In AvroUtils.toGenericRecord,

beam/sdks/java/extensions/avro/src/main/java/org/apache/beam/sdk/extensions/avro/schemas/utils/AvroUtils.java

Line 646 in 83fcb2f

public static GenericRecord toGenericRecord(

A SqlTypes.DATE field will resolve to schema of date logic type backed by an INT:

beam/sdks/java/extensions/avro/src/main/java/org/apache/beam/sdk/extensions/avro/schemas/utils/AvroUtils.java

Line 1218 in 83fcb2f

.addToSchema(org.apache.avro.Schema.create(org.apache.avro.Schema.Type.INT));

However, its value is set to a long:

beam/sdks/java/extensions/avro/src/main/java/org/apache/beam/sdk/extensions/avro/schemas/utils/AvroUtils.java

Line 1383 in 83fcb2f

return ((java.time.LocalDate) value).toEpochDay();

LocalDate.toEpochDay returns a long

This causes error on encoding:

SEVERE: Error handling executePlan
org.apache.avro.UnresolvedUnionException: Not in union ["null",{"type":"int","logicalType":"date"}]: 10957 (field=d)
	at org.apache.avro.generic.GenericDatumWriter.writeField(GenericDatumWriter.java:247)
	at org.apache.avro.generic.GenericDatumWriter.writeRecord(GenericDatumWriter.java:234)
	at org.apache.avro.generic.GenericDatumWriter.writeWithoutConversion(GenericDatumWriter.java:145)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:95)
	at org.apache.avro.generic.GenericDatumWriter.write(GenericDatumWriter.java:82)
	at org.apache.beam.sdk.extensions.avro.coders.AvroCoder.encode(AvroCoder.java:466)
	at org.apache.beam.sdk.coders.Coder.encode(Coder.java:140)
	at org.apache.beam.sdk.util.CoderUtils.encodeToSafeStream(CoderUtils.java:86)
	at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:70)
	at org.apache.beam.sdk.util.CoderUtils.encodeToByteArray(CoderUtils.java:55)
	at org.apache.beam.sdk.util.CoderUtils.clone(CoderUtils.java:168)
	at org.apache.beam.runners.core.InMemoryStateInternals.uncheckedClone(InMemoryStateInternals.java:910)

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