Support to generator JavaScript code from a HTTP testCase

[LinuxSuRen]

Below is the Golang code generator.

https://github.com/LinuxSuRen/api-testing/blob/e05ff4b485e0c525ea7f78b4d653ddc230c5716e/pkg/generator/golang_generator.go
Similarly, we could add the Java code generator. Please feel free to do some research to find out how to make an HTTP request in JavaScript.

See others #112

[YukiCoco]

I wanna try it out :)

[LinuxSuRen]

Great. Please go ahead.