[JS] add parameter 'useURLSearchParams' to use JS build-in UrlSearchParams, instead of deprecated npm lib 'querystring'

[tobifb]

Fixes #19947

• Added a new parameter 'useURLSearchParams' to the JavaScript Client Codegen
• If set to true, the deprecated npm 'querystring' is not generated anymore in the javascript code. Instead we use UrlSearchParams, which is a built-in function of javascript.
• If set to false, the old behavior is still generated.
• Default value is 'false'

Additional tests:

• manual testing with openapi-generator-cli additional properties and configuration file

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@CodeNinjai @frol @cliffano

[wing328]

@tobifb thanks for the PR

what about simply replacing the deprecated lib without an option?

from what I understand, this is not a breaking change (even without the option)

[wing328]

tested the option with updated samples via #20002

and the result is good

i'll file another PR to make this option enabled by default

thanks again for the PR

[wing328]

To fallback, set useURLSearchParams to false, e.g. --additional-properties useURLSearchParams=true in the CLI

[tobifb]

Sorry for the late reply. Thanks for the changes!