fix: only_on not working on password and implementation of show_on/hide_on all

[mihaimdm22]

Let me know what can be improved
Thanks!

*Documentation also updated for 'Showing / Hiding fields on different views' and 'Password Field' sections.

[codecov]

Codecov Report

Merging #171 into master will increase coverage by 0.50%.
The diff coverage is 94.23%.

@@            Coverage Diff             @@
##           master     #171      +/-   ##
==========================================
+ Coverage   96.03%   96.53%   +0.50%     
==========================================
  Files          87      130      +43     
  Lines        1890     3550    +1660     
==========================================
+ Hits         1815     3427    +1612     
- Misses         75      123      +48     

Impacted Files	Coverage Δ
lib/avo/app/tools_manager.rb	50.00% <50.00%> (ø)
spec/dummy/app/policies/user_policy.rb	56.25% <53.33%> (ø)
spec/dummy/app/avo/filters/published_filter.rb	66.66% <66.66%> (ø)
lib/avo/app/action.rb	80.00% <80.00%> (ø)
lib/avo/engine.rb	85.71% <85.71%> (ø)
lib/avo/app/fields/boolean_field.rb	93.75% <87.50%> (ø)
lib/avo/app/app.rb	89.70% <89.70%> (ø)
lib/avo/app/fields/key_value_field.rb	90.90% <90.90%> (ø)
.../avo/app/fields/field_extensions/has_field_name.rb	91.66% <91.66%> (ø)
...lds/field_extensions/visible_in_different_views.rb	92.85% <92.85%> (ø)
... and 170 more

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[adrianthedev]

I left a few tweaks. Let me know what you think.