Apply spread operator when delegating variadic static funcs to companion

[vincentborko]

Motivation

When a public/internal static function has a variadic parameter, the generated companion delegation drops the spread operator, producing uncompilable Kotlin (issue #64):

Argument type mismatch: actual type is 'kotlin.Array<CapturedType(out kotlin.String)>', but 'kotlin.String' was expected.

Root cause

A static function is transpiled to an override on the type's companion object plus a delegating open fun on the inner CompanionClass that calls back into the concrete implementation. Both are declared with vararg, but appendCompanionClassDelegatingMember (KotlinStatementTypes.swift) forwarded each argument by bare name. Inside the delegate a vararg parameter has its Array type, so the call needs the spread (*) operator.

Before:

open fun initBridge(context: Int, vararg libraryNames: String) = A.initBridge(context = context, libraryNames)

After:

open fun initBridge(context: Int, vararg libraryNames: String) = A.initBridge(context = context, *libraryNames)

Fix

Prefix the forwarded argument with * when the parameter is variadic — for both the unlabeled (*libraryNames) and labeled (names = *names) argument forms.

Testing

• New StaticTests.testStaticVariadicSpread asserts the spread is emitted for both the unlabeled and labeled variadic forms (byte-for-byte against the generated Kotlin).
• Full swift test suite green (923 tests, 0 failures).