feature: fields Default Option

[mihaimdm22]

Hey, let me know what you think about this. I also updated the table in Fields Usage (https://www.notion.so/3bf67c80933b4735bb20be3f1bcdef3e?v=f35ad1cd8d5046c8acb40d61be67af66).

PS: One test is not working and don't understand why, maybe we can look together into it. Already spend too much time on it.

[codecov]

Codecov Report

Merging #88 into master will increase coverage by 0.09%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master      #88      +/-   ##
==========================================
+ Coverage   96.33%   96.42%   +0.09%     
==========================================
  Files          98      100       +2     
  Lines        2262     2348      +86     
==========================================
+ Hits         2179     2264      +85     
- Misses         83       84       +1     

Impacted Files	Coverage Δ
spec/system/avocado/default_field_spec.rb	95.12% <95.12%> (ø)
lib/avocado/app/fields/field.rb	98.55% <100.00%> (+0.11%)	⬆️
lib/avocado/app/fields/hidden_field.rb	100.00% <100.00%> (ø)
spec/dummy/app/services/avocado/resources/team.rb	100.00% <100.00%> (ø)
.../app/services/avocado/resources/team_membership.rb	100.00% <100.00%> (ø)
spec/dummy/app/services/avocado/resources/user.rb	100.00% <100.00%> (ø)
spec/system/avocado/boolean_group_field_spec.rb	100.00% <0.00%> (ø)
...ec/dummy/app/services/avocado/resources/project.rb	100.00% <0.00%> (ø)
spec/system/avocado/select_field_spec.rb	100.00% <0.00%> (ø)
... and 1 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 7645ca9...e1c4248. Read the comment docs.

[adrianthedev]

Just a few nitpicks, but pretty close to merge.