Issue 120 Fix bug cannot create Tag Definitions

[tungleduyxyz]

The issue raised here: rack/rack#2128
I found that the issue comes from the rack gem, the parse_nested_query function.
The Gemfile from killbill-admin-ui: gem 'rails', '~> 7.0.1' -> rails 7.0.8 -> will install rack 2.2.8
The Gemfile from killbill-admin-ui-standalone: gem 'rails', '~> 7.0.0' -> rails 7.1.2 -> will install rack 3.0.8
You can compare the parse_nested_queryhere:

• 3.0.8:https://github.com/rack/rack/blob/3-0-stable/lib/rack/query_parser.rb
• 2.2.8:https://github.com/rack/rack/blob/2-2-stable/lib/rack/query_parser.rb

Here is our raw source data for POST:

authenticity_token=1cC60RSAumGOde_9icOPLNwLOUroWsWAb7mmqI6S6McpehjcvoKr8p57qivQd_F3DyHjrcGyksSXaq2EWrPEhg&t
ag_definition%5Bid%5D=&tag_definition%5Bapplicable_object_types%5B0%5D%5D=SUBSCRIPTION&tag_definition%5Bname%5D=test1&tag_definition%5Bdescription%5D=te
st1&commit=Save

And the result when using Rack::Utils.parse_nested_query:

• 3.0.8:

{"authenticity_token"=>"1cC60RSAumGOde_9icOPLNwLOUroWsWAb7mmqI6S6McpehjcvoKr8p57qivQd_F3DyHjrcGyksSXaq2EWrPEhg",
 "tag_definition"=>{"id"=>"", "applicable_object_types[0"=>{"]"=>"SUBSCRIPTION"}, "name"=>"test1", "description"=>"test1"},
 "commit"=>"Save"}

• 2.2.8:

{"authenticity_token"=>"1cC60RSAumGOde_9icOPLNwLOUroWsWAb7mmqI6S6McpehjcvoKr8p57qivQd_F3DyHjrcGyksSXaq2EWrPEhg",
 "t\nag_definition"=>{"id"=>""},
 "tag_definition"=>{"applicable_object_types"=>{"0"=>"SUBSCRIPTION"}, "name"=>"test1", "description"=>"te\nst1"},
 "commit"=>"Save"}

Rack 3.0 no longer supports parsing nested params like a[b[c]], the correct nested params should be a[b][c].