- Adding is_valid_fn and update_fn, both return 1 for success and 0 for failure with an optional error message.
- Bugfix in handling boundary check of unsigned numeric types (was boundaries as signed)
- Adding more numeric types to generic mechanism: uint, ulonglong, long, time_t, off_t
- More verbose error replies ("argument must be between" in out of range CONFIG SET (like config file parsing)

- add capability for each config to have a callback to check if value is valid and return error string
  will enable converting many of the remaining custom configs into generic ones (reducing the x4 repetition for set,get,config,rewrite)
- add capability for each config to  to run some update code after config is changed (only for CONFIG SET)
  will also enable converting many of the remaining custom configs into generic ones
- add capability to move default values from server.h and server.c to config.c
  will reduce many excess lines in server.h and server.c (plus, no need to rebuild the entire code base when a default change 8-))

other behavior changes:
- fix bug in bool config get (always returning 'yes')
- fix a bug in modifying jemalloc-bg-thread at runtime (didn't call set_jemalloc_bg_thread, due to bad merge conflict resolution (my fault))
- side effect when a failed attempt to enable activedefrag at runtime, we now respond with -ERR and not with -DISABLED

try to fix an unstable test (module hook for loading progress)

Add macro in bio.h

fix move command: WATCH/MULTI/EXEC mechanism breaks 

Add missing header

Refactored configs into types that can be generic

Add module api for looking into INFO fields

Support streams in general module API functions

Expose used memory to modules via redismodule api

macro fix

Adjustments for active defrag defaults

fix typo in scripting.acl

there were two lssues, one is taht BGREWRITEAOF failed since the initial one was still in progress
the solution for this one is to enable appendonly from the server startup so there's no initial aofrw.

the other problem was 0 loading progress events, theory is that on some
platforms a sleep of 1 will cause a much greater delay due to the context
switch, but on other platform it doesn't. in theory a sleep of 100 micro
for 1k keys whould take 100ms, and with hz of 500 we should be gettering
50 events (one every 2ms). in practise it doesn't work like that, so trying
to find a sleep that would be long enough but still not cause the test to take
too long.

Module API: add support for long double conversions and replies

rename RN_SetLRUOrLFU -> RM_SetLRU and RN_SetLFU

Redis sentinel kill pubsub client connections as well

fix leak in module api rdb test

Update adlist.h

Improve RM_Call() errno classification.

aof: fix assignment for aof_fsync_offset

test infra: improve prints on failed assertions

expires & blocking: handle ready keys as call()

RM_Call() will now use EBADF and ENONET in addition to EINVAL in order
to provide more information about errors (i.e. when return value is
NULL).