Feat rust newtypes members

[MikaelMayer]

Description

This PR adds

• Support for newtypes wrapping other newtypes
• Full conversions between newtypes and primitive types
• Support for methods on newtypes
• It also adds an attribute {:rust_erased true/false} for newtypes to override the default erasure setting for newtypes, which is:
  • Newtypes without members: Erased (so that we can see Rust's native types like u8, u32, etc.)
  • Newtypes with members: Not erased (to improve legibility of the code in Rust)
• Support for general newtypes on booleans
• Support in the generated Rust AST for metadata on types, to know if a type supports Copy or now. Previously it had to be known statically for primitive, but now with newtypes we need to embed this information into the tree.
• Support for wrapping operations for bitvectors and newtypes based on bitvectors

How has this been tested?

• Modified the test comp/rust/newtypes.dfy to support all the new cases, including use of the attribute {:rust_erased} and various cases
• Added test case newtypesrefresh.dfy for the newtypes on booleans
• Had to fix the code to make existing tests to pass

By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.