[MacPorts] #63130: port doctor: check for broken SDKs and missing SDK receipts

[MacPorts]

#63130: port doctor: check for broken SDKs and missing SDK receipts
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 Reporter:  jmroot       |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  base         |    Version:
 Keywords:               |       Port:
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 It would be good to notify the user if they have an SDK that is missing
 essential files like in #63099, and also if the CLT receipt is missing as
 described in ProblemHotlist#reinstall-clt (see the cltversion portgroup
 for the appropriate check).

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Ticket URL: <https://trac.macports.org/ticket/63130>
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