Add support for embedded objects

[marcosmko]

Implementation for @Embedded annotation based on #328 by @hsul4n.

Closing #9

[codecov]

Codecov Report

Merging #538 (51e32cd) into develop (93753a9) will increase coverage by 6.08%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #538      +/-   ##
===========================================
+ Coverage    84.34%   90.42%   +6.08%     
===========================================
  Files           73       10      -63     
  Lines         1846      188    -1658     
===========================================
- Hits          1557      170    -1387     
+ Misses         289       18     -271     

Flag	Coverage Δ
floor	90.42% <ø> (+6.08%)	⬆️
floor_generator	?

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Impacted Files	Coverage Δ
...or/lib/processor/transaction_method_processor.dart
...rator/lib/processor/deletion_method_processor.dart
...loor_generator/lib/misc/annotation_expression.dart
...enerator/lib/processor/query_method_processor.dart
floor_generator/lib/value_object/foreign_key.dart
...enerator/lib/misc/change_method_writer_helper.dart
floor_generator/lib/value_object/dao.dart
...oor_generator/lib/value_object/type_converter.dart
.../processor/error/query_method_processor_error.dart
...erator/lib/misc/extension/dart_type_extension.dart
... and 45 more

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