Enabled tracing & logging for Lambda API & API Gw

[dreamorosi]

Issue #, if available:

86, #87

Description of changes:

• Enabled tracing for API Lambda's via Chalice config.json file.
• Added AWSXRayDaemonWriteAccess managed policy to API Lambda's IAM Role as detailed in this doc.
• Enabled tracing for API Gateway stage via Chalice external_resources.json file.
• Enabled access logging for API Gateway stage via Chalice external_resources.json file; used standard JSON format detailed in this doc.

I confirm that I have tested the changes but would appreciate a review/

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