Initial ffm support

- Starter for jline ffm terminal provider
- Build changes for compiling with gradle toolchains
  defaulting to jdk22
- spring-shell-sample-ffm which compiles with jdk22
- ci workflow setups jdk 17/22
- Relates #1131

spring-shell-starters/spring-shell-starter-ffm/spring-shell-starter-ffm.gradle

@@ -0,0 +1,12 @@
+plugins {
+	id 'org.springframework.shell.starter'
+	id 'org.springframework.shell.toolchain'
+}
+
+description = 'Spring Shell Starter FFM'
+
+dependencies {
+	management platform(project(':spring-shell-management'))
+	api(project(':spring-shell-starters:spring-shell-starter'))
+	implementation 'org.jline:jline-terminal-ffm'
+}