Autoload encodings on the main ractor #27

Job	Run time
make (zjit-bindgen, To fix: use patch in logs, --enable-zjit=dev --with-gcc=clang-14, /usr/lib/ll...	5m 42s
make (btest, --enable-zjit=dev)	4m 49s
make (zjit-test, --enable-yjit --enable-zjit=dev)	3m 59s
make (test-all, --enable-zjit=dev, ../src/test/ruby/test_zjit.rb)	4m 48s
ZJIT Ubuntu result	2s
	19m 20s

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