Document that read/write methods may throw IAE and make sure this is true:

- Replace !! with requireNotNull()
- Add try/catch to wrap all other exceptions (mainly protobuf parser ones)
- Add tests for malformed input for both read and write
- Hide InconsistentMetadataException from public API
- Replace its external usages with IllegalArgumentException

libraries/tools/kotlinp/src/org/jetbrains/kotlin/kotlinp/Kotlinp.kt

@@ -5,7 +5,6 @@
 
 package org.jetbrains.kotlin.kotlinp
 
-import kotlinx.metadata.InconsistentKotlinMetadataException
 import kotlinx.metadata.jvm.KotlinClassMetadata
 import kotlinx.metadata.jvm.KotlinModuleMetadata
 import kotlinx.metadata.jvm.UnstableMetadataApi
@@ -30,7 +29,7 @@ class Kotlinp(private val settings: KotlinpSettings) {
         val header = file.readKotlinClassHeader() ?: throw KotlinpException("file is not a Kotlin class file: $file")
         return try {
             KotlinClassMetadata.read(header)
-        } catch (e: InconsistentKotlinMetadataException) {
+        } catch (e: IllegalArgumentException) {
             throw KotlinpException("inconsistent Kotlin metadata: ${e.message}")
         }
     }

libraries/tools/kotlinp/src/org/jetbrains/kotlin/kotlinp/printers.kt

@@ -171,7 +171,7 @@ private fun printType(type: KmType): String {
         } else {
             val (variance, argumentType) = argument
             if (variance == null || argumentType == null)
-                throw InconsistentKotlinMetadataException("Variance and type must be set for non-star type projection")
+                throw IllegalArgumentException("Variance and type must be set for non-star type projection")
             val argumentTypeString = printType(argumentType)
             buildString {
                 if (variance != KmVariance.INVARIANT) {