[KT-70029] Allow setting of configFile

[omarismail94]

The tasks:

"wasmJsBrowserDevelopmentWebpack",
"wasmJsBrowserDevelopmentRun",
"wasmJsBrowserProductionWebpack",
"wasmJsBrowserProductionRun",

of type KotlinWebpack have the same output configFile file:

projectBuildDir/js/packages/projectName-wasm-js/webpack.config.js

I want to be able to set these to different locations.

[ilgonmic]

Could we please leave configFile as is to not change type of the field?
Instead I propose to add new property configurationFile with type RegularFileProperty with convention value npmProjectDir.map { it.resolve("webpack.config.js") }.
It should look like something like that

    @get:OutputFile
    open val configurationFile: RegularFileProperty = objects.fileProperty()
        .convention(
            objects.fileProperty().fileProvider(
                npmProjectDir.map { it.resolve("webpack.config.js") }
            )
        )

And change configFile from @get:OutputFile to @get:Deprecated (because we are going to have new property as output file)