KTOR-1460 Switch to org.w3c.fetch

[hfhbd]

trafficstars

2nd PR after KTOR-2230

Subsystem Client, JS

Motivation KTOR-1460

• browser: Reduce code size by using std lib provided fetch api/classes
• nodeJS: added minimal defined classes manually

Solution Switch to org.w3c.fetch or use manually defined classes on nodeJS

[hfhbd]

As you can not test nodeJsProductionRun in unit tests, I used this test project: https://github.com/hfhbd/ktorTestNodeJS with mavenLocal

[rsinukov]

Hi @hfhbd. JS tests are failing on CI

[e5l]

Could you rebase if if it's actual or should we close?

[hfhbd]

Sorry for the late answer. I rebased it, but removing the classes will break abi.