Distinguished Name implementation

[rviau42]

Due to the structure change, this Pull Request can introduce breaking changes

Distinguished Name implementation

Add DistinguishedName class which contains a collection of RelativeDistinguishedName
according to RFC5280 and X.501.

Subject and Issuer properties in Certificate, CRL, OCSP, ... classes doesn't accept Array anymore but Array.

Instead of:

	certificate.issuer.typesAndValues.push(new AttributeTypeAndValue({
		type: "2.5.4.6", // Country name
		value: new asn1js.PrintableString({ value: "RU" })
	}));
	certificate.issuer.typesAndValues.push(new AttributeTypeAndValue({
		type: "2.5.4.3", // Common name
		value: new asn1js.BmpString({ value: "Test" })
	}));

You must declare these fields with:

	certificate.issuer.relativeDistinguishedNames.push(new RelativeDistinguishedNames({
		typesAndValues: [new AttributeTypeAndValue({
			type: "2.5.4.6", // Country name
			value: new asn1js.PrintableString({ value: "RU" })
		})]
	}));
	certificate.issuer.relativeDistinguishedNames.push(new RelativeDistinguishedNames({
		typesAndValues: [new AttributeTypeAndValue({
			type: "2.5.4.3", // Common name
			value: new asn1js.BmpString({ value: "Test" })
		})]
	}));

DN toString()

For debugging purpose or more, it could be useful to get a string representation of DNs.
DistinguishedName.toString() prodives a String representation of DN almost conformed to RFC4514

To achieve to this conversion, there is a new Map containing the most common OID used for DN, based on RFC4519(https://tools.ietf.org/html/rfc4519): AttributeTypeDictionnary
The 57 OID described in section #2 AttributeType and section #3 ObjectClass are retrieved.

certificate.issuer.relativeDistinguishedNames.push(new RelativeDistinguishedNames({
    typesAndValues: [
        new AttributeTypeAndValue({
            type: "2.5.4.6", // Country name
            value: new asn1js.PrintableString({ value: "RU" })
        }),
        new AttributeTypeAndValue({
            type: "2.5.4.7", // Location
            value: new asn1js.PrintableString({ value: "Moscow" })
        }),
    ]
}));
certificate.issuer.relativeDistinguishedNames.push(new RelativeDistinguishedNames({
    typesAndValues: [new AttributeTypeAndValue({
        type: "2.5.4.3", // Common name
        value: new asn1js.BmpString({ value: 'John "Jim" Smith, III' })
    })]
}));

console.log(certificate.issuer.toString())
// EXPECTED: C=RU+L=Moscow,CN=John \"Jim\" Smith\, III

[microshine]

@rviau42 Thanks. Update looks good. All tests are successfully passed.