Mapping UI refactor

[syphax-bouazzouni]

TODO

• Feature: Add modal view component ncbo/bioportal_web_ui#225

Migration to Hotwire

• Migrate and remove bp_create_mappings.js.erb (500 lines less)

In concept page

• Remove the button "create an external mapping"
• Merge the external form with the base(normal) mapping form
• Add form validation to the mapping creation form
• Add the possibility to edit a mapping
• update mapping delete (from batch delete to individual)

In mapping page

• Style mappings page ncbo/bioportal_web_ui#209
• Add the possibility to create mapping with a source and target class
• Add the possibility to search the mappings of a class
• Add the possibility to search the mappings between two classes

[syphax-bouazzouni]

Note for the form validation of the mappings creation/edition, the problem was that in the API there were not validation implemented. For now what i did is just a temporary validation in the UI (follow up ontoportal-lirmm/ontologies_linked_data#41).