New connector pattern - kendra-bedrock-rds-postgresql-sam

[baka656]

PR: #13

Description: This pattern contains a sample stack that utilizes an AWS Lambda function to retrieve data from Amazon RDS PostgreSQL data source indexed by Amazon Kendra and then pass it to Amazon Bedrock to generate a response. The pattern includes usage of the Amazon RDS PostgreSQL data source connector.
Language: Python
Framework: SAM

Security Review:
rds_postgresql_cfn_nag_result.txt