Application Plan "Methods & Metrics" collapsible table

[josemigallas]

What this PR does / why we need it:

Adds a caret to the title and hides/shows the table.

Which issue(s) this PR fixes

THREESCALE-3093: APIAP: Application plan > edit > Methods & Metrics - Collapsible table

Tested in:

• Firefox
• Chrome
• Safari (although it jumps to the top when resizing the table 🐛)
• IE11

Verification steps

• Go to apiconfig/application_plans/22/edit and click on the names of each Backend API under Metrics, Methods, Limits & Pricing Rules
• Metrics from each particular API should collapse/expande
• The caret should rotate
• When no JS, there shouldn't any caret
• When no metrics, there shouldn't any caret either

[guicassolato]

I agree this issue was not well explained in the Jira. As stated in the tracking document for the implementation of APIAP in porta, the tables (plural) to make expandable/collapsible are the ones of the metrics and methods of each backend API, not the whole section of methods and metrics of the page.

[codecov]

Codecov Report

Merging #1113 into master will decrease coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master    #1113     +/-   ##
=========================================
- Coverage   92.33%   92.23%   -0.1%     
=========================================
  Files        2386     2370     -16     
  Lines       78804    76832   -1972     
=========================================
- Hits        72764    70868   -1896     
+ Misses       6040     5964     -76

Impacted Files	Coverage Δ
app/lib/csv/messages_exporter.rb	16.66% <0%> (-75%)	⬇️
app/lib/logic/nginx_proxy.rb	27.27% <0%> (-72.73%)	⬇️
lib/last_traffic.rb	33.33% <0%> (-66.67%)	⬇️
app/lib/events/importers/alert_importer.rb	33.33% <0%> (-62.75%)	⬇️
lib/range_hacks.rb	37.5% <0%> (-62.5%)	⬇️
app/models/numeric_hash.rb	41.17% <0%> (-58.83%)	⬇️
app/workers/janitor_worker.rb	42.85% <0%> (-57.15%)	⬇️
.../initializers/backport_pg_10_support_to_rails_4.rb	30% <0%> (-50%)	⬇️
app/workers/purge_stale_objects_worker.rb	50% <0%> (-50%)	⬇️
config/initializers/postgres.rb	50% <0%> (-50%)	⬇️
... and 275 more

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