Add support for WITHOUT ROWID tables

[John-He-928]

See #358

Added withoutRowid parameter to @Entity annotation, which appends WITHOUT ROWID to the CREATE TABLE statement if set to true.

Simple test cases included.

[codecov]

Codecov Report

Merging #365 into develop will decrease coverage by 0.06%.
The diff coverage is 73.68%.

@@             Coverage Diff             @@
##           develop     #365      +/-   ##
===========================================
- Coverage    81.51%   81.44%   -0.07%     
===========================================
  Files           59       59              
  Lines         1509     1525      +16     
===========================================
+ Hits          1230     1242      +12     
- Misses         279      283       +4     

Flag	Coverage Δ
#floor	81.44% <73.68%> (-0.07%)	⬇️
#floor_generator	81.01% <73.68%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...or/lib/processor/error/entity_processor_error.dart	3.57% <0.00%> (-0.43%)	⬇️
floor_generator/lib/value_object/entity.dart	96.22% <83.33%> (+0.22%)	⬆️
...loor_generator/lib/processor/entity_processor.dart	76.31% <90.00%> (+1.31%)	⬆️

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[mqus]

Please also change the toString method.

[mqus]

So first of all, thank you for your contribution and sorry for not looking at it sooner. I have mainly two minor issues with your code: The first is the toString method (see the comment above) and the second is the following:
I'm wondering if it would make sense to add a check for points 1 and 3 in the sqlite docs , meaning that WITHOUT ROWID tables should have a primary key that is not auto-incremented.

Apart from that, I'm pretty happy with your changes. But @vitusortner should probably take a look.

[John-He-928]

@mqus Thank you for the review. I will update the code :)

[vitusortner]

Thanks for your contribution and thanks for your patience!