[BUG] Investigate Error Handling for unhandled SQL query

[birschick-bq]

Environment

• DocumentDB JDBC driver version: 1.4.4
• DocumentDB server version: n/a
• OS: [e.g. MacOS Big Sur 11.5.1, Windows 10 64-bit] n/a
• BI Tool or client name: n/a
• BI Tool or client version: n/a
• Java version (if known): n/a

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Problem Description

1. Steps to reproduce:
   • In DocumentDbQueryMappingService original exceptions can be hidden on call to getExceptionMessages(e) - for example, if it throws a null pointer exception, hiding the original exception. This should be adjusted to ensure that the original error is preserved, and other error handling should be investigated to look for similar issues.
2. Expected behaviour:
3. Actual behaviour:
4. Error message/stack trace:
5. Any other details that can be helpful:

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Screenshots

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JDBC log

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