Support for query result encryption

[SkyHacks]

Objective:

Add support for optional query result encryption as described by the SDK.

Summary:

• Adds missing configuration options to README with their default values and descriptions.
• Adds encryptionOption and encryptionKmsKey as optional configuration options.
• Ensures encryptionKmsKey is defined when KMS encryption is used.

Note: For some reason, the build step added imports for ResultConfiguration and EncryptionConfiguration to request.ts from the SDK even though they are not being referenced.

Testing:

A new test was added to maintain code coverage levels. All tests still passing.

=============================== Coverage summary ===============================
Statements   : 95.12% ( 195/205 )
Branches     : 80.39% ( 82/102 )
Functions    : 100% ( 25/25 )
Lines        : 95.9% ( 187/195 )
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[KoteiIto]

Thank you!