BIND 10 #2638: make dns::rdata::generic::detail::CharString public

[BIND 10 Development]

#2638: make dns::rdata::generic::detail::CharString public
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                   Reporter:  jelte  |                 Owner:
                       Type:  task   |                Status:  new
                   Priority:         |             Milestone:  Next-Sprint-
  medium                             |  Proposed
                  Component:         |              Keywords:
  Unclassified                       |             Sensitive:  0
               CVSS Scoring:         |           Sub-Project:  DNS
            Defect Severity:  N/A    |  Estimated Difficulty:  0
Feature Depending on Ticket:         |           Total Hours:  0
        Add Hours to Ticket:  0      |
                  Internal?:  0      |
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 With the current hidden-by-convention approach, it requires we either use
 pimpl in all the rdata implementations we need them in, or forward-
 declarations (which are tricky because it is a typedef). In both cases it
 also forces dynamic allocation of memory which isn't really necessary.

 So we should make it public. For now I think we can just move the
 definition to isc::dns or isc::dns::rdata. (discussion of whether to make
 it a Real Class is pending).

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Ticket URL: <https://bind10.isc.org/ticket/2638>
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