fix(dynamite): support all default value types

[Leptopoda]

I've tested it with nextcloud/openapi-extractor#105 and it works fine.
At least the generated code does not have any errors and looks god.

[codecov]

Codecov Report

Attention: Patch coverage is 4.92308% with 309 lines in your changes are missing coverage. Please review.

Project coverage is 28.33%. Comparing base (f0b5f8a) to head (214a23a).
Report is 5 commits behind head on main.

❗ Current head 214a23a differs from pull request most recent head b3124a5. Consider uploading reports for the commit b3124a5 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1983      +/-   ##
==========================================
- Coverage   28.43%   28.33%   -0.10%     
==========================================
  Files         245      246       +1     
  Lines       81449    81754     +305     
==========================================
+ Hits        23161    23169       +8     
- Misses      58288    58585     +297     

Flag	Coverage Δ		*Carryforward flag
dynamite	22.63% <22.72%> (-0.09%)	⬇️
dynamite_end_to_end_test	57.76% <3.63%> (-4.87%)	⬇️
dynamite_runtime	82.65% <ø> (ø)		Carriedforward from f0b5f8a
neon_dashboard	92.56% <ø> (ø)
neon_framework	38.36% <ø> (ø)
neon_talk	96.67% <ø> (ø)
nextcloud	25.69% <ø> (-0.01%)	⬇️
sort_box	90.90% <ø> (ø)		Carriedforward from f0b5f8a

*This pull request uses carry forward flags. Click here to find out more.

Files	Coverage Δ
...e/dynamite_end_to_end_test/lib/all_of.openapi.dart	88.88% <100.00%> (+0.13%)	⬆️
...e/dynamite_end_to_end_test/lib/any_of.openapi.dart	70.43% <ø> (ø)
...te_end_to_end_test/lib/authentication.openapi.dart	91.37% <ø> (ø)
...ite/dynamite_end_to_end_test/lib/enum.openapi.dart	85.00% <ø> (ø)
...namite_end_to_end_test/lib/interfaces.openapi.dart	70.00% <ø> (ø)
...namite_end_to_end_test/lib/nested_ofs.openapi.dart	68.96% <100.00%> (+0.30%)	⬆️
...e/dynamite_end_to_end_test/lib/one_of.openapi.dart	62.36% <ø> (ø)
...ite_end_to_end_test/lib/pattern_check.openapi.dart	90.62% <ø> (ø)
...mite_end_to_end_test/lib/request_body.openapi.dart	85.29% <ø> (ø)
.../dynamite_end_to_end_test/lib/some_of.openapi.dart	36.36% <ø> (ø)
... and 21 more