Helper macros to make ser/deser binary protocols easier

LocatedError: For a given error enum {Name} generate a struct called Located{Name} that carries the Span (the error location in the input stream) info along the error. Additionally, generates [From] for nom library errors, external, and another located errors.

```rust use netgauzeserdemacros::LocatedError;

[derive(LocatedError, Eq, PartialEq, Clone, Debug)]

pub enum ExtendedCommunityParsingError { NomError(#[fromnom] nom::error::ErrorKind), CommunityError(#[fromlocated(module = "self")] CommunityParsingError), UndefinedCapabilityCode(#[from_external] UndefinedBgpCapabilityCode), }

[derive(LocatedError, Eq, PartialEq, Clone, Debug)]

pub enum CommunityParsingError { NomError(#[from_nom] nom::error::ErrorKind), }

[derive(Copy, Clone, PartialEq, Eq, Debug)]

pub struct UndefinedBgpCapabilityCode(pub u8);

fn test() { let span = Span::new(&[1, 2, 3]); // LocatedExtendedCommunityParsingError is generated by LocatedError let _located = LocatedExtendedCommunityParsingError::new( span, ExtendedCommunityParsingError::UndefinedCapabilityCode(UndefinedBgpCapabilityCode(1))); } ```

WritingError: Decorate an enum as an error for serializing binary protocol provides the following decorations for any members of the enum.

1. #[from_std_io_error] automatically generate [From] implementation from [std::io::Error] to a [String].
2. #[from], automatically generates a [From] implementation for a given type.

Example:

```rust use netgauzeserdemacros::WritingError;

[derive(WritingError, Eq, PartialEq, Clone, Debug)]

pub enum BgpMessageWritingError { /// std::io::Error will be converted to this value StdIOError(#[fromstdio_error] String),

/// BgpOpenMessageWritingError will be converted to this value
OpenError(#[from] BgpOpenMessageWritingError),

} ```