Expose query as an endpoint

[kazhuravlev]

This feature allows users to mark some query as available for api call. After user mark query as available for API call - he will receive an curl command with uniq query and with signed JWT token in header. This token will expired at specified (by user) time. Default - 1 month.

Tasks

• Add public address to config. This address should contain a scheme (http/https), domain and port. Like that https://dbgatewway.example.com
• Add ACL that enables this feature for all users
• Add new handler to serve this queries
• Add params to configure JWT tokens
• Describe api docs. If applicable and possible - use this tool.

Example of ACL

{
	"user": "admin@example.com",
	"op": "expose-api-endpoint",
	"target": "*",
	"tbl": "*",
	"allow": true
}