Allow querying for all reports with type = any

A new way of querying for all reports was introduced. All reports are queried by including type = "any" in the query body. Ex: AST: curl -X POST http://HOST:PORT/pdb/query/v4 -H 'Content-Type:application/json' -d '{"query": [ "from", "reports", [ "extract", [ ], [ "=", "type", "any" ] ] ]}' PQL: curl -X POST http://HOST:PORT/pdb/query/v4 -H 'Content-Type:application/json' -d '{"query": "reports[] { type = \"any\"}"}' An improvement for query validation was also made: if an "and" or "or" is provided without any clauses the error message is more helpful. Ex: '{"query": [ "from", "reports", [ "extract", [ ], ["and"] ] ]}' error with:    'and' takes at least one argument, but none were suppllied vs before it showed the error from translating the query to SQL : 2021-05-24 09:55:29.460 EEST [40624] ERROR: syntax error at or near ")" at character 2199