Feature: Change Authorize to use UserID instead of Token

[Musilah]

Is your feature request related to a problem? Please describe.

We need to make this user ID, rather than the token.
Originally posted by @dborovcanin in absmach/magistrala-old#272 (comment)

Describe the feature you are requesting, as well as the possible use case(s) for it.

For this function we are required to use the UserID instead of token to authorize the subject over the object.

func (svc service) Authorize(ctx context.Context, pr PolicyReq) error {
	if err := svc.PolicyValidation(pr); err != nil {
		return errors.Wrap(svcerr.ErrMalformedEntity, err)
	}
	if pr.SubjectKind == TokenKind {
		key, err := svc.Identify(ctx, pr.Subject)
		if err != nil {
			return errors.Wrap(svcerr.ErrAuthentication, err)
		}
		if key.Subject == "" {
			if pr.ObjectType == GroupType || pr.ObjectType == ThingType || pr.ObjectType == DomainType {
				return errors.ErrDomainAuthorization
			}
			return svcerr.ErrAuthentication
		}
		pr.Subject = key.Subject
		pr.Domain = key.Domain
	}
	if err := svc.checkPolicy(ctx, pr); err != nil {
		return err
	}
	return nil
}

Indicate the importance of this feature to you.

Should-have

Anything else?

No response

[arvindh123]

@dborovcanin Please provide your approach guidance for this task.