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## Description
This PR makes struct fields private by default and introduces explicit
public struct fields:
```
pub struct Struct {
pub public_field: u8,
private_field: u8,
}
```
Private fields can be accessed only withing the module in which their
struct is declared.
Error messages are properly orchestrated so that no conflicting or
duplicated messages are emitted. Since the change is a breaking change,
relevant suggestion on how to fix the particular issue are given.
To avoid an abrupt breaking change, the errors are temporarily turned
into warnings. These warnings will become errors in the upcoming
versions of Sway. The demo section below demonstrate how the errors will
look like, and how a one warning equivalent looks now.
Standard library structs like `Vec` or `String`, are adapted where
needed by adding the `pub` keyword to the fields that are accessed
outside of the struct declaration module. Some of these fields should
very likely remain public, but some, like e.g., `RawBytes::ptr` or
`Vec::buf` should be private. Adjusting the standard library to properly
utilize private fields is out of scope of this PR and will be done
separately. I expect breaking changes in the STD once we start modeling
structs keeping encapsulation in mind.
In addition, the PR:
- migrates
[annotate_snippets](https://github.com/rust-lang/annotate-snippets-rs)
crate to its latest version (breaking changes)
- removes a redundant non-existing field error and orchestrates
non-existing field error with privacy errors
- replaces an invalid and misleading error when accessing fields on
storage elements that are not structs
Closes #4692.
## Known limitations
There is an issue in displaying multi-line code snippets, which is
independent of these changes, but wasn't apparent before. The issue is
visible in the demo section below, where the struct bodies are sometimes
not fully shown, and they should be. This issue is reported in #5499 and
will be solved in a separate PR.
## Demo (an excerpt 😄)
### Private struct field is inaccessible
![Private struct field is
inaccessible](
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