Optimizations part 2 (#15280)

* make all pluginsd functions inline, instead of function pointers

* dynamic MRG partitions based on the number of CPUs

* report the right size of the MRG

* prevent invalid read on pluginsd exit

* faster service_running() check; fix compiler warnings; shutdown replication after streaming to prevent crash on shutdown

* sender is now using a spinlock

* rrdcontext uses spinlock

* replace select() with poll()

* signed calculation of threads

* disable read-ahead on jnfv2 files during scan

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