Fix BigQuery destination normalization to accept any date-time format.

[alafanechere]

A user using a Marketo to BigQuery connection is facing a bug during basic normalization (slack message here).
It appears that the Marketo connector is outputting a date-time format which is not properly handled by BigQuery leading to the following normalization error:
Invalid timestamp: '2018-09-07T17:37:18Z+0000'.

This issue is closely related to a similar normalization problem with Snowflake (#5713)

Environment

• Airbyte version: 0.30.33-alpha
• OS Version / Instance: n1-standard-2
• Deployment: Docker
• Source Connector and version: airbyte/source-marketo:0.1.0
• Destination Connector and version: airbyte/destination-bigquery:0.5.0
• Severity: High
• Step where error happened: Sync job

Current Behavior

Marketo source outputs date-time format such as 2018-09-07T17:37:18Z+0000 in the createdAt field of the Program's stream records.
Normalization fails with Invalid timestamp: '2018-09-07T17:37:18Z+0000' error.

Expected Behavior

BigQuery normalization should handle casting this format to timestamp.

Logs

logs-18-2-marketo.txt