feat(rds/postgres): pass database url to management lambda via SSM Parameter Store

[mskrajnowski]

rds/postgres

• Updated default postgres version to 10.15
• Passes the database url to the management lambda using an SSM parameter
• Places the management lambda in the VPC only when public input is false (default), since lambdas placed in a public subnet don't have internet access (can't access SSM)

rds/postgres/management_lambda

• Added database_url_param input and updated the lambda code to fetch the value from SSM when necessary
• Added role_name and role_arn outputs
• rds/postgres/management_lambda code is now built using @vercel/ncc

lambda

• Added role_name and role_arn outputs