Add a thread to asynchronously process metadata updates (#13783)

* Remove old metalog text fle processing

* Add metadata event loop

* Move functions from sqlite_functions.c to sqlite_metadata.c
Queue updates to the metadata event loop
Migration to remove unused tables
Cleanup unused functions

* Queue chart labels to metadata

* Store chart labels to metadata

* During shutdown, run full speed

* Add shutdown prepare
Handle SHUTDOWN in the cmd queue function
Add worker thread to handle host/chart/dimension metadata doing dictionary traversals

* Remove unused RRDIM_FLAG_ACLK
Add flags to trigger host/chart/dimension metadata processing

* Incremental processing of chart metadata writes

* Store host labels

* Remove redundant return statements

* Change unit tests / cleanup

* Fix rescheduling

* Schedule chart labels update by setting the RRDSET_FLAG_METADATA_UPDATE flag

* Queue commands to update metadata for dimension and host labels

* Make sure we do a final scan to store metadata during shutdown (if needed)

* Remove unused structures
Adjust queue size since we do batch processing of updates without queueing individual messages
Remove pragma mmap for now
Fix memory leak during sqlite unittest (minor)

* Dont update if we are in archive mode

* Cleanup

* Build entire message payload and store

* Initialize worker completion properly

* Properly skip host check for pending metadata updates

* Report bind param failures
Add worker request inside the data payload
Initialize variables to silence warnings
Rebase on master

* Report the chart id (not the dimension) and the dimension id when storing a dimension

* Compilation warnings in 32bit

* Add DEFINE for the queries

* Remove commented out code

* * Remove items parameter from unitest
* Remove commented out code
* sqlite_metadata.h contains only public items
* Use sleep_usec instead of usleep
* Rename metadata_database_init_cmd_queue to metadata_init_cmd_queue
* Rename metadata_database_enq_cmd_noblock to metadata_enq_cmd_noblock

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