[Ceres]: Add arbitrary size byte arrays (#456)

* Extend compiler to allow bytes()/bytes as type

* Add split_any, to_fixed_size, size, to_any_size, Int.to_bytes and String.to_bytes

* Add tests

* Use and and not andalso in unify, some things have side-effects

* Bump to aebytecode v3.3.0

* Changelog + update documentation

* fix wording in documentation

test/contracts/bad_bytes_to_x.aes

@@ -0,0 +1,5 @@
+// include "String.aes"
+contract BytesToX =
+  entrypoint fail1(b : bytes()) = Bytes.to_fixed_size(b)
+  entrypoint fail2(b : bytes(4)) = Bytes.to_fixed_size(b)
+  entrypoint fail3(b : bytes()) = Bytes.to_any_size(b)