turn on explicitApi for SIR modules

Merge-request: KT-MR-13448
Merged-by: Artem Olkov <artem.olkov@jetbrains.com>

native/swift/sir-analysis-api/build.gradle.kts

@@ -4,6 +4,10 @@ plugins {
 
 description = "Build Swift IR from Analysis API"
 
+kotlin {
+    explicitApi()
+}
+
 dependencies {
     compileOnly(kotlinStdlib())
 

native/swift/sir-analysis-api/src/org/jetbrains/kotlin/sir/analysisapi/SirGenerator.kt

@@ -17,11 +17,11 @@ import org.jetbrains.kotlin.sir.analysisapi.transformers.toForeignFunction
 /**
  * A root interface for classes that produce Swift IR elements.
  */
-interface SirFactory {
-    fun build(fromFile: KtFile): List<SirDeclaration>
+public interface SirFactory {
+    public fun build(fromFile: KtFile): List<SirDeclaration>
 }
 
-class SirGenerator : SirFactory {
+public class SirGenerator : SirFactory {
     override fun build(fromFile: KtFile): List<SirDeclaration> = analyze(fromFile) {
         val res = mutableListOf<SirForeignFunction>()
         fromFile.accept(Visitor(res))