BigQuery StorageWrite: JsonToProtoMessage timestamp error

[caseyduquettesc]

Environment details

1. BigQuery StorageWrite
2. OS type and version: MacOS 11.6.3
3. Java version: 11
4. version(s): 2.8.4

Steps to reproduce

1. Create a bigquery table with only one field of type TIMESTAMP and with name "d"
2. Use JsonStreamWriter with this JSON Array [{"d":"2022-02-06 07:24:47.84"}]
3. run

Stack trace

java.lang.IllegalArgumentException: JSONObject does not have a int64 field at root.d.
	at com.google.cloud.bigquery.storage.v1.JsonToProtoMessage.fillField(JsonToProtoMessage.java:351)
	at com.google.cloud.bigquery.storage.v1.JsonToProtoMessage.convertJsonToProtoMessageImpl(JsonToProtoMessage.java:176)
	at com.google.cloud.bigquery.storage.v1.JsonToProtoMessage.convertJsonToProtoMessage(JsonToProtoMessage.java:115)
	at com.google.cloud.bigquery.storage.v1.JsonStreamWriter.append(JsonStreamWriter.java:140)
	at com.google.cloud.bigquery.storage.v1.JsonStreamWriter.append(JsonStreamWriter.java:99)
	at persistence.BigqueryStreamingClient.streamJsonArray(BigqueryStreamingClient.java:72)

External references such as API reference guides

• ?

Any additional information below

This is pretty similar to #1330 / #1345, but happens with TIMESTAMP columns. I was wondering if the same fix could be applied? If a string is provided for a TIMESTAMP column, can you convert it? The legacy BQ insert api did and would just make it easer to migrate. Thanks!