Change Query methods API and functionality

[ArtDu]

Redesigned custom methods API with @Query annotation in Repository interfaces:

• Instead of specifying the @Tuple annotation (indicated which stack of converters to use) on the methods, we use the output argument in the @Query annotation. Two arguments AUTO or TUPLE can be passed there, which corresponds to the callForObject and callForTuple methods.
• Made it so that AUTO can convert tuples too by adding some functionality in callForObject.
• Now custom @Query methods always use ReturnType to match the converter stack. DomainType is only used for predefined functions(SimpleTarantoolRepository).
• Added an exception if we expect TUPLE, but there is no metadata to convert it. Previously, we just received an empty object and could not figure out what was wrong.
• Since we are now looking at returnType we ignore the result if void is specified

Also for details see rfc: #78

Closes #68 Closes #69 Closes #78

[ArtDu]

It also seems worth renaming these classes, since now they are not consistent with each other:

TarantoolRepositoryTupleQueryExecutor TarantoolRepositoryQueryObjectExecutor