feat: add schema update support for bigquerystorage Write API
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Description
Please add schema update support similar to what we have in the BigQueryStorage Java client: [https://github.com/googleapis/java-bigquerystorage/pull/1447](https://github.com/googleapis/java-bigquerystorage/pull/1447)
When schema is updated, we should:
1) close the existing StreamWriter
2) update TableSchema and Descriptor
3) create a new StreamWriter with the updated TableSchema and Descriptor
Related customer impact: Case #29451211 (salesforce)
Imported from Jira [BEAM-13944](https://issues.apache.org/jira/browse/BEAM-13944). Original Jira may contain additional context.
Reported by: stephaniewang526.
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