Unify and Improve error handling of restricted strings

[Nicceboy]

Fixes #260

Adds alphabet_name function for StaticPermittedAlphabet trait for better error messages.

[Nicceboy]

Actually error reporting isn't that good. Might be better to give the failed value also in the error message like in other codecs

[XAMPPRocky]

Actually error reporting isn't that good. Might be better to give the failed value also in the error message like in other codecs

Yes, hough I think it might be good to have a unified error across all codecs for strings, so this logic can be better shared, and if codecs can provide more context they can wrap the error type.

[XAMPPRocky]

I think this would be better as a enum, and have it as a associated const instead of a fn.

[Nicceboy]

Related to this #185, maybe it can be handled in the same time.

[XAMPPRocky]

Thank you for your PR! Looks good to me, I notice a lot of commented out code, can that code be removed or is there a reason it's commented out?

[Nicceboy]

I was just finishing it, some small cleaning still to do.

I unified all the string types, so that they implemented StaticPermittedAlphabet. Also for Teletex type while the characters itself are not implemented.

I had to wrap all the errors behind PermittedAlphabetError, otherwise it was too difficult to implement (For example, there can be both constraint-related errors or string-type related errors.)

Also all TryFrom, From and Deref implementations are done with macros for all the types same time now.

[Nicceboy]

Invalid restricted string error, for example, should look something like this now:

---- coer::tests::invalid_ia5_oer stdout ----
[src/coer.rs:697:9] e = DecodeError {
    kind: PermittedAlphabetError {
        reason: InvalidRestrictedString {
            source: InvalidIA5String(
                InvalidIA5String {
                    character: 129,
                },
            ),
        },
    },
    codec: Coer,
}

[Nicceboy]

I think it is ready now. Not sure what is the performance since all characters on restricted strings are verified now in every codec.

[XAMPPRocky]

Thank you for your PR!