Add @Label annotation

[programmerr47]

Need to add @Label annotation. Currently, it will be parameterless (but then we will add strategies and e.t.c.) I think we need to implement next rules or similar to them (in order to write less code):

These rules are for parameters without @Label annotation:

• if there is only one parameter in a method, then it is a label. Thus we need to convert it to String (if it isn't a string already)
• if there are two parameters and one of them is String, and another is Long or Int, then first will be a label, and last will be a value (I will not implement it now but for the future)
• if there are two parameters and one of them is String, then it is considered as a label, and other we need to convert to long
• if there are two parameters and one of them is Long or Int, then it is considered as a value, and other we need to convert to String
• if there are more than two parameters, then there will be a runtime exception.

Rules for @Label annotation:

• if there are two values and one of them marked as @Label, then we need to convert somehow other to value
• if there are more than two parameters, then regardless to annotation we need to throw an exception

[programmerr47]

Created issue tasks:

• if there is only one parameter in a method, then it is a label. Thus we need to convert it to String (if it isn't a string already)
• if there are two parameters and one of them is String, and another is Long or Int, then first will be a label, and last will be a value (I will not implement it now but for the future)
• if there are two parameters and one of them is String, then it is considered as a label, and other we need to convert to long
• if there are two parameters and one of them is Long or Int, then it is considered as a value, and other we need to convert to String
• if there are more than two parameters, then there will be a runtime exception.
• if there are two values and one of them marked as @Label, then we need to convert somehow other to value
• if there are more than two parameters, then regardless to annotation we need to throw an exception

[programmerr47]

Need to
change -> "if there are two parameters and one of them is String, then it is considered as a label, and other we need to convert to long"
to -> "if there are two parameters and one of them is String, and other is not Number, then throw Exception"

[programmerr47]

Need to add documentation

[programmerr47]

https://github.com/programmerr47/ganalytics/wiki/Annotations#label