K2. Minor. Rename FirConstExpression to FirLiteralExpression

FirConstExpression is usually confused with "constant" calculations,
while in fact, it just denotes a simple literal expression
and `1 + 1` isn't represented by a FirConstExpression.

^KT-64314 Fixed

compiler/fir/checkers/checkers-component-generator/src/org/jetbrains/kotlin/fir/checkers/generator/Main.kt

@@ -56,7 +56,7 @@ fun main(args: Array<String>) {
         alias<FirStringConcatenationCall>("StringConcatenationCallChecker")
         alias<FirTypeOperatorCall>("TypeOperatorCallChecker")
         alias<FirResolvedQualifier>("ResolvedQualifierChecker")
-        alias<FirConstExpression<*>>("ConstExpressionChecker")
+        alias<FirLiteralExpression<*>>("LiteralExpressionChecker")
         alias<FirCallableReferenceAccess>("CallableReferenceAccessChecker")
         alias<FirThisReceiverExpression>("ThisReceiverExpressionChecker")
         alias<FirWhileLoop>("WhileLoopChecker")