Merge pull request #148 from kusumotolab/jdk21

jgit was updated

add test files

functionality for treating guarded pattern

functionality for treating record pattern

test code for EnhancedFor with Record was added

update dependencies

log instruments were commented out

use goooler.shadow instead of johnrengelman.shadow

update build.gradle

change comments

prepared for String Template, but this feature is still preview at jdk21

bug fix for record treatment

add Record feature

bug fix

add executor, but still doesn't work

test was slightly updated

add methods for new program elements

update logback-classic

update guava

gradle and jdtcore versions were updated

jgit and jdt was upgraded to the latest version

modification to treat switch statements