Internal struct and function names. Replace "redis" => "server". This isn't really a trademark problem. We just want to make the code a little more Redis agnostic.

• struct redisCommand => serverCommand (The struct defined in server.h, not the function in hiredis.)
• redisCommandGroup
• redisCommandProc, redisGetKeysProc (function typedefs)
• redisServer => valkeyServer (src/server.h) It's just 3 occurrences.
• redisObject => serverObject
• redisTLSContextConfig => serverTLSContextConfig
• redisError => serverError
• redisFunctionSym
• redisSortObject, redisSortOperation
• redisCommandArg, redisCommandArgType (src/commands.h)
• redisDb => serverDb, done in Rename redisDb to serverDb #156
• Rename redisOpArray to serverOpArray #157
• redisOp
• Rename redisMemOverhead to serverMemOverhead #159
• Rename redis_member2struct ro server_member2struct #166
• redisAtomic
• rebranding: change "redis" to "server" for git_sha related #170 (functions redisGitSHA1, redisGitDirty, redisBuildId, redisBuildIdRaw, redisBuildIdString)
• Functions...
  long long redisPopcount(void *s, long count);
  int redisSetProcTitle(char *title);
  int validateProcTitleTemplate(const char *template);
  int redisCommunicateSystemd(const char *sd_notify_msg);
  void redisSetCpuAffinity(const char *cpulist);
  int redisFork(int purpose);

Note 1: We shouldn't change deps/hiredis/ (redisContext, redisCommand(), redisBufferWrite(),
etc.) since it's a vendored dependency. If we want to change it, it should probably be by forking it and vendoring the forked dependency instead.

Note 2: Don't change the module API here. See #146.