Update JLine to 4.x (#1511)

- Remove dependency org.fusesource.jansi:jansi
- In 4.x, org.fusesource.jansi:jansi was replaced with org.jline:jansi.
Instead of adding this new dependency, this commit replaces Pkl’s single
Jansi usage with custom code that preserves existing behavior. Fixing
existing ANSI quirks is left for a future PR.
- Replace jline-terminal-ansi with jline-terminal-jni
  - In 4.x, only -jni and -ffm are available (-ffm requires Java 22+)
- Configure native-image build for jline-terminal-jni

As updating JLine is delicate, I manually tested `pkl repl` and `jpkl
repl` on Windows 11 (using Windows Terminal) and on Ubuntu, and found no
issues. However, I do not have access to a macOS machine.

buildSrc/src/main/kotlin/NativeImageBuild.kt

@@ -119,6 +119,8 @@ abstract class NativeImageBuild : DefaultTask() {
         add("--initialize-at-build-time=")
         // needed for messagepack-java (see https://github.com/msgpack/msgpack-java/issues/600)
         add("--initialize-at-run-time=org.msgpack.core.buffer.DirectBufferAccess")
+        // needed for jline-terminal-jni
+        add("--initialize-at-run-time=org.jline.nativ,org.jline.terminal.impl.jni")
         add("--no-fallback")
         add("-H:IncludeResources=org/pkl/core/stdlib/.*\\.pkl")
         add("-H:IncludeResources=org/jline/utils/.*")