Commits on Jul 20, 2022

1. [ADDED] JetStream: Direct message get …

   This starts with a new boolean in a stream configuration:
   ```
   // Allow higher performance, direct access to get individual messages. E.g. KeyValue
   bool  AllowDirect;
   ```
   
   When a stream is created with that boolean, then it is possible
   to use this API to get messages:
   ```
   natsStatus
   js_DirectGetMsg(natsMsg **msg, jsCtx *js, const char *stream, jsOptions *opts, jsDirectGetMsgOptions *dgOpts);
   ```
   
   The possible options to get a message are:
   ```
   typedef struct jsDirectGetMsgOptions
   {
           uint64_t        Sequence;               ///< Get the message at this sequence
           const char      *NextBySubject;         ///< Get the next message (based on sequence) for that subject
           const char      *LastBySubject;         ///< Get the last message on that subject
   
   } jsDirectGetMsgOptions;
   ```
   
   Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

   

   kozlovic committed Jul 20, 2022
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