semantic analysis: validate operation definition in Document

[lrlna]

Description

Validate the operation definition and add related methods to the SourceDatabase.

Related Issues, #144, #147

Specification

	Documentation	SEMANTIC PROCESSING	ERROR	WARNING	HINT	SUGGESTION	QUERIES TO BE ADDED TO SOURCEDATABASE
Operation	Defined in spec		shorthand can only be used if there are no variables or directives shorthand cannot be used if there are multiple operations		show where the variable or directive is already defined show other operations		variables in an operation definition → Vec<Variables> directives in operation definition → Vec<Directives> operation_definitions → Vec<OperationDefinitions>