Support disabling Kotlin module metadata remapping

[Goooler]

Closes #1874.

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• CHANGELOG's "Unreleased" section has been updated, if applicable.

[Goooler]

CC @Tapchicoma

[Goooler]

We need to expose the transform step for .kotlin_module files.

[Tapchicoma]

As I see - the current change just disables remapping, but still does not trigger generic transformer. It would be nice to add a support for custom .kotlin_module transformer.

[Goooler]

There is a new issue: if the relocators is not empty, remapKotlinModule will be called first. Should we pass the relocated module file to transformers? I believe what you want here is passing the original module file to your custom transformer, and doing nothing from Shadow side. Just like

shadow/src/main/kotlin/com/github/jengelman/gradle/plugins/shadow/tasks/ShadowCopyAction.kt

Lines 183 to 187 in bd7f137

	else -> {
	val relocated = relocators.relocatePath(path)
	if (transform(fileDetails, relocated)) return
	fileDetails.writeToZip(relocated)
	}

[Goooler]

276692a

Disabling the newly added flag should align the behaviors with 8.x versions. Are you fine with the new flag?

[Tapchicoma]

Yes, should be fine